Ethereum Developer Tools List

A guide to available tools, components, patterns, and platforms for developing applications on Ethereum.

Creation of this list was spurred by product managers at ConsenSys who saw a need for better sharing of tools, development patterns, and components amongst both new and experienced blockchain developers.

This resource is meant to be focused on developer tools, but the repo also includes:

• Ethereum Ecosystem Resources for useful DApps, educational resources, wallets, and services.

Contributions are welcome!

Feel free to submit a pull request, with anything from small fixes to tools you'd like to add (or remove!). If adding a new tool, please add a brief description that you think new developers would understand.

Many thanks to the ~100 contributors including @corbpage and @pakaplace of Meridio for curating, and @jpantunes for restructuring the list in a more logical way.

• Projects that do not have a working product will not be added.
• Projects that are deprecated or no longer maintained will be removed.
• Projects that are paid/restricted services without open source code or developer reviews will be further vetted.

^Is the above fair? Share your input here - https://github.com/ConsenSys/ethereum-developer-tools-list/pull/70

Table of Contents

• Ethereum Developer Tools List
  • Contributions are welcome!
  • Table of Contents
  • New developers start here
  • Developer Tools
    • Developing Smart Contracts
      • Smart Contract Languages
      • Frameworks
      • IDEs
    • Other tools
    • Test Blockchain Networks
      • Test Ether Faucets
    • Communicating with Ethereum
      • Frontend Ethereum APIs
      • Backend Ethereum APIs
      • Bootstrap/Out-of-Box tools
      • Ethereum ABI (Application Binary Interface) tools
      • Patterns & Best Practices
        • Patterns for Smart Contract Development
        • Upgradeability
    • Infrastructure
      • Ethereum Clients
      • Storage
      • Messaging
    • Distribution
    • Testing Tools
    • Security Tools
    • Monitoring
    • Other Miscellaneous Tools
    • Smart Contract Standards & Libraries
      • ERCs - The Ethereum Request for Comment repository
      • Popular Smart Contract Libraries
    • Developer Guides for 2nd Layer Infrastructure
      • Scalability
      • Payment/State Channels
      • Plasma
      • Side-Chains
      • Privacy / Confidentiality
        • ZK-SNARKs
      • Scalability + Privacy
      • ZK-STARKs
      • Prebuilt UI Components

New developers start here

• Solidity - The most popular smart contract language.
• Metamask - Browser extension wallet to interact with Dapps.
• Truffle - Most popular smart contract development, testing, and deployment framework. Install the cli via npm and start here to write your first smart contracts.
• Truffle boxes - Packaged components for the Ethereum ecosystem.
• Hardhat - Flexible, extensible and fast Ethereum development environment.
• Foundry - Smart contract development toolchain. Foundry manages your dependencies, compiles your project, runs tests, deploys, and lets you interact with the chain from the command-line.
• Cryptotux - A Linux image ready to be imported in VirtualBox that includes the development tools mentioned above
• OpenZeppelin Wizards - Not sure where to start? Use the interactive generator to bootstrap your contract and learn about the components offered in OpenZeppelin Contracts.
• EthHub.io - Comprehensive crowdsourced overview of Ethereum- its history, governance, future plans and development resources.
• Brownie - Brownie is a Python framework for deploying, testing and interacting with Ethereum smart contracts.
• Moralis - Moralis is a cross-chain Enterprise-grade Web3 API that can be used for efficiently indexing blockchain data, authenticate various web3 wallets, and listen to real-time blockchain events
• Ethereum Stack Exchange - Post and search questions to help your development life cycle.
• dfuse - Slick blockchain APIs to build world-class applications.
• Biconomy - Do gasless transactions in your dapp by enabling meta-transactions using simple to use SDK.
• Blocknative — Blockchain events before they happen. Blocknative's portfolio of developers tools make it easy to build with mempool data.
• useWeb3.xyz — A curated overview of the best and latest resources on Ethereum, blockchain and Web3 development.
• Geth — An ethereum development client based in Go.
• CryptoZombies — An interactive code school that teaches you to write smart contracts in Solidity.
• Smartcontract challenges — Learn Solidity and Vyper with challenges.
• Solidity by Example — An introduction to Solidity with simple examples.
• L2Beat - Discover Ethereum Layer2 solutions and the risks associated with using them.

Developer Tools

Developing Smart Contracts

Smart Contract Languages

• Solidity - Ethereum smart contracting language
• Vyper - New experimental pythonic programming language
• Yul - is an intermediate programming language that is compiled to bytecode for addressing the needs of different backends.
• Huff - is not so much a language as a tool with features like macros and constants that make it easier to write pure EVM opcodes. Huff can be used to write highly-efficient contracts for use in production, or it can also serve as a way for beginners to learn more about the EVM.
• Fe-Lang - Fe is a statically typed language for the Ethereum Virtual Machine (EVM). It is inspired by Python and Rust.

Frameworks

• Truffle - Most popular smart contract development, testing, and deployment framework. The Truffle suite includes Truffle, Ganache, and Drizzle. Deep dive on Truffle here
• Hardhat - Flexible, extensible and fast Ethereum development environment.
• Foundry - Smart contract development toolchain. Foundry manages your dependencies, compiles your project, runs tests, deploys, and lets you interact with the chain from the command-line.
• Brownie - Brownie is a Python framework for deploying, testing and interacting with Ethereum smart contracts.
• Embark - Framework for DApp development
• Waffle - Framework for advanced smart contract development and testing, small, flexible, fast (based on ethers.js)
• Dapp - Framework for DApp development, successor to DApple
• Etherlime - ethers.js based framework for Dapp deployment
• Parasol - Agile smart contract development environment with testing, INFURA deployment, automatic contract documentation and more. It features a flexible and unopinionated design with unlimited customizability
• 0xcert - JavaScript framework for building decentralized applications
• OpenZeppelin SDK - OpenZeppelin SDK: A suite of tools to help you develop, compile, upgrade, deploy and interact with smart contracts.
• sbt-ethereum - A tab-completey, text-based console for smart-contract interaction and development, including wallet and ABI management, ENS support, and advanced Scala integration.
• Cobra - A fast, flexible and simple development environment framework for Ethereum smart contract, testing and deployment on Ethereum virtual machine(EVM).
• Epirus - Java framework for building smart contracts.
• Etherspot - MultiChain Smart Wallet SDK, supports most of the EVM-compatible chains.

IDEs

• Remix - Web IDE with built in static analysis, test blockchain VM.
• Ethereum Studio - Web IDE. Built in browser blockchain VM, Metamask integration (one click deployments to Testnet/Mainnet), transaction logger and live code your WebApp among many other features.
• Atom - Atom editor with Atom Solidity Linter, Etheratom, autocomplete-solidity, and language-solidity packages
• Vim solidity - Vim syntax file for solidity
• Visual Studio Code - Visual Studio Code extension that adds support for Solidity
• Ethcode - Visual Studio Code extension to compile, execute & debug Solidity & Vyper programs
• Intellij Solidity Plugin - Open-source plug-in for JetBrains IntelliJ Idea IDE (free/commercial) with syntax highlighting, formatting, code completion etc.
• YAKINDU Solidity Tools - Eclipse based IDE. Features context sensitive code completion and help, code navigation, syntax coloring, build in compiler, quick fixes and templates.
• Eth Fiddle - IDE developed by The Loom Network that allows you to write, compile and debug your smart contract. Easy to share and find code snippets.
• Solidity + Hardhat VSCode Extension - Solidity and Hardhat support by the Hardhat team.

Other tools

• Atra Blockchain Services - Atra provides web services to help you build, deploy, and maintain decentralized applications on the Ethereum blockchain.
• Azure Blockchain Dev Kit for Ethereum for VSCode - VSCode extension that allows for creating smart contracts and deploying them inside of Visual Studio Code
• Ethereum Remix- Ethereum Remix plugins in VSCode - This plugin brings Remix plugins to Visual Studio Code.
• Crypto Address Lens - VSCode Extension which improves the development experience with Ethereum style addresses.
• Ramen - An intuitive, easy-to-use terminal UI to interact with Ethereum (Mainnet, Testnet or local network)

Test Blockchain Networks

• ethnode - Run an Ethereum node (Geth or Parity) for development, as easy as npm i -g ethnode && ethnode.
• Ganache - App for test Ethereum blockchain with visual UI and logs
• Kaleido - Use Kaleido for spinning up a consortium blockchain network. Great for PoCs and testing
• Besu Private Network - Run a private network of Besu nodes in a Docker container
• Orion - Component for performing private transactions by PegaSys
• Artemis - Java implementation of the Ethereum 2.0 Beacon Chain by PegaSys
• Cliquebait - Simplifies integration and accepting testing of smart contract applications with docker instances that closely resembles a real blockchain network
• Local Raiden - Run a local Raiden network in docker containers for demo and testing purposes
• Private networks deployment scripts - Out-of-the-box deployment scripts for private PoA networks
• Local Ethereum Network - Out-of-the-box deployment scripts for private PoW networks
• Ethereum on Azure - Deployment and governance of consortium Ethereum PoA networks
• Ethereum on Google Cloud - Build Ethereum network based on Proof of Work
• Infura - Ethereum API access to Ethereum networks (Mainnet, Ropsten, Rinkeby, Goerli, Kovan)
• CloudFlare Distributed Web Gateway - Provides access to the Ethereum network through the Cloudflare instead of running your own node
• Chainstack - Shared and dedicated Ethereum nodes as a service (Mainnet, Ropsten)
• Alchemy - Blockchain Developer Platform, Ethereum API, and Node Service (Mainnet, Ropsten, Rinkeby, Goerli, Kovan)
• ZMOK - JSON-RPC Ethereum API (Mainnet, Rinkeby, Front-running Mainnet)
• Watchdata - Provide simple and reliable API access to Ethereum blockchain
• cheapETH - 100% compatible Ethereum network for cheap and easy development

Test Ether Faucets

• Rinkeby faucet
• Kovan faucet
• Ropsten faucet (MetaMask)
• Ropsten faucet (rpanic)
• Goerli faucet1
• Goerli faucet2
• Universal faucet
• Nethereum.Faucet - A C#/.NET faucet
• Chainlink Faucet

Communicating with Ethereum

Frontend Ethereum APIs

• Web3.js - Javascript Web3
• Eth.js - Javascript Web3 alternative
• Ethers.js - Javascript Web3 alternative, useful utilities and wallet features
• useDApp - React based framework for rapid DApp development on Ethereum
• light.js A high-level reactive JS library optimized for light clients.
• Web3Wrapper - Typescript Web3 alternative
• Ethereumjs - A collection of utility functions for Ethereum like ethereumjs-util and ethereumjs-tx
• Moralis NextJS SDK - An easy to use React hooks library for NextJS dapp to index and monitor various blockchain data
• Alchemy-web3.js - Javascript Web3 wrapper with automatic retries, access to Alchemy's enhanced APIs, and robust websocket connections.
• flex-contract and flex-ether - Modern, zero-configuration, high-level libraries for interacting with smart contracts and making transactions.
• ez-ens - Simple, zero-configuration Ethereum Name Service address resolver.
• web3x - A TypeScript port of web3.js. Benefits includes tiny builds and full type safety, including when interacting with contracts.
• Nethereum - Cross-platform Ethereum development framework
• dfuse - A TypeScript library to use dfuse Ethereum API
• Drizzle - Redux library to connect a frontend to a blockchain
• Tasit SDK - A JavaScript SDK for making native mobile Ethereum dapps using React Native
• useMetamask - a custom React Hook to manage Metamask in Ethereum ĐApp projects
• WalletConnect - Open protocol for connecting Wallets to Dapps
• Subproviders - Several useful subproviders to use in conjunction with Web3-provider-engine (including a LedgerSubprovider for adding Ledger hardware wallet support to your dApp)
• ethvtx - ethereum-ready & framework-agnostic redux store configuration. docs
• Strictly Typed - Javascript alternatives
  • elm-ethereum
  • purescript-web3
• ChainAbstractionLayer - Communicate with different blockchains (including Ethereum) using a single interface.
• Delphereum - a Delphi interface to the Ethereum blockchain that allows for development of native dApps for Windows, macOS, iOS, and Android.
• Torus - Open-sourced SDK to build dapps with a seamless onboarding UX
• Fortmatic - A simple to use SDK to build web3 dApps without extensions or downloads.
• Portis - A non-custodial wallet with an SDK that enables easy interaction with DApps without installing anything.
• create-eth-app - Create Ethereum-powered front-end apps with one command.
• Scaffold-ETH - Beginner friendly forkable github for getting started building smart contracts.
• Notify.js - Deliver real-time notifications to your users. With built-in support for Speed-Ups and Cancels, Blocknative Notify.js helps users transact with confidence. Notify.js is easy to integrate and quick to customize.
• Quiver - A collection of React hooks and components for Ethereum dApps. Built by Raid Guild.
• Rainbow - RainbowKit is a React library that makes it easy to add wallet connection to your dapp. It's intuitive, responsive and customizable.
• Nexth - A Next.js + Ethereum starter kit to quickly ship your Web3 projects ⚡

Backend Ethereum APIs

• Web3.py - Python Web3
• Web3.php - PHP Web3
• Ethereum-php - PHP Web3
• Web3j - Java Web3
• Nethereum - .Net Web3
• Ethereum.rb - Ruby Web3
• rust-web3 - Rust Web3
• Web3.hs - Haskell Web3
• KEthereum - Kotlin Web3
• Moralis NodeJS SDK - NodeJS SDK that integrates with Moralis to index EVM chains
• Moralis Python SDK - Python SDK that integrates with Moralis to index EVM chains
• Eventeum - A bridge between Ethereum smart contract events and backend microservices, written in Java by Kauri
• Ethereumex - Elixir JSON-RPC client for the Ethereum blockchain
• Ethereum-jsonrpc-gateway - A gateway that allows you to run multiple Ethereum nodes for redundancy and load-balancing purposes. Can be ran as an alternative to (or on top of) Infura. Written in Golang.
• EthContract - A set of helper methods to help query ETH smart contracts in Elixir
• Marmo - Python, JS, and Java SDK for simplifying interactions with Ethereum. Uses relayers to offload transaction costs to relayers.
• Ethereum Logging Framework - provides advanced logging capabilities for Ethereum applications and networks including a query language, query processor, and logging code generation
• Watchdata - Provide simple and reliable API access to Ethereum blockchain
• w3 - Fast and modular Golang JSON RPC client with first-class ABI support
• Transpose - Powerful APIs for accessing human-readable Ethereum data at scale.

Bootstrap/Out-of-Box tools

• Truffle boxes - Packaged components for the Ethereum ecosystem
• Ethereum Boilerplates - A full-stack boilerplate to get started building dapp on any EVM chains
• Create Eth App - Create Ethereum-powered frontend apps with one command
• Besu Private Network - Run a private network of Besu nodes in a Docker container
• Testchains - Pre-configured .NET devchains for fast response (PoA)
• Blazor/Blockchain Explorer - Wasm blockchain explorer (functional sample)
• Local Raiden - Run a local Raiden network in docker containers for demo and testing purposes
• Private networks deployment scripts - Out-of-the-box deployment scripts for private PoA networks
• Parity Demo-PoA Tutorial - Step-by-Step tutorial for building a PoA test chain with 2 nodes with Parity authority round consensus
• Local Ethereum Network - Out-of-the-box deployment scripts for private PoW networks
• Kaleido - Use Kaleido for spinning up a consortium blockchain network. Great for PoCs and testing
• Cheshire - A local sandbox implementation of the CryptoKitties API and smart contracts, available as a Truffle Box
• aragonCLI - aragonCLI is used to create and develop Aragon apps and organizations.
• ColonyJS - JavaScript client that provides an API for interacting with the Colony Network smart contracts.
• ArcJS - Library that facilitates javascript application access to the DAOstack Arc ethereum smart contracts.
• Arkane Connect - JavaScript client that provides an API for interacting with Arkane Network, a wallet provider for building user-friendly dapps.
• Onboard.js - Blocknative Onboard is the quick and easy way to add multi-wallet support to your project. With built-in modules for more than 20 unique hardware and software wallets, Onboard saves you time and headaches.
• web3-react - React framework for building single-page Ethereum dApps

Ethereum ABI (Application Binary Interface) tools

• Online ABI encoder - Free ABI encoder online service that allows you to encode your Solidity contract’s functions and constructor arguments.
• Online Solidity ABI Encoder - Online Solidity ABI Encoder to encode smart contract arguments, and also perform read and write operations on the blockchain.
• ABI decoder - library for decoding data params and events from Ethereum transactions
• ABI-gen - Generate Typescript contract wrappers from contract ABI's.
• Ethereum ABI UI - Auto-generate UI form field definitions and associated validators from an Ethereum contract ABI
• headlong - type-safe Contract ABI and Recursive Length Prefix library in Java
• EasyDapper - Generate dapps from Truffle artifacts, deploy contracts on public/private networks, offers live customizable public page to interact with contracts.
• One Click dApp - Instantly create a dApp at a unique URL using the ABI.
• Truffle Pig - a development tool that provides a simple HTTP API to find and read from Truffle-generated contract files, for use during local development. Serves fresh contract ABIs over http.
• Ethereum Contract Service - A MESG Service to interact with any Ethereum contract based on its address and ABI.
• Nethereum-CodeGenerator - A web based generator which creates a Nethereum based C# Interface and Service based on Solidity Smart Contracts.
• EVMConnector - Create shareable contract dashboards and interact with arbitrary EVM-based blockchain functions, with or without an ABI.
• contract-admin - Minimalistic UI tool for interacting with your smart contracts
• Smart Contract GUI - Instant access to read from and write to any smart contract directly (on any EVM chain) by simply uploading the ABI. A simple and powerful UX enables rapid execution of smart contract calls locally, on testnets and mainnets. It also comes packed with a host of useful tools for integration testing.
• Sidekik - Debug, test, and grok smart contracts with a visual UI that lets you interact with local or deployed EVM-based smart contracts. Use cases include hot reloading UI for your smart contracts as you code them, easier auditing without writing scripts to hit a function, end-to-end testing your code before deploying it, and more.
• Web3 Client - Web IDE allows you to execute methods deployed smart contract and Share with others.

.

Patterns & Best Practices

Patterns for Smart Contract Development

• Dappsys: Safe, simple, and flexible Ethereum contract building blocks
  • has solutions for common problems in Ethereum/Solidity, eg.
    • Whitelisting
    • Upgradable ERC20-Token
    • ERC20-Token-Vault
    • Authentication (RBAC)
    • ...several more...
  • provides building blocks for the MakerDAO or The TAO
  • should be consulted before creating own, untested, solutions
  • usage is described in Dapp-a-day 1-10 and Dapp-a-day 11-25
• OpenZeppelin Contracts: An open framework of reusable and secure smart contracts in the Solidity language.
  • Likely the most widely-used libraries and smart contracts
  • Similar to Dappsys, more integrated into Truffle framework
  • Blog about Best Practices with Security Audits
• Advanced Workshop with Assembly
• Simpler Ethereum Multisig - especially section Benefits
• CryptoFin Solidity Auditing Checklist - A checklist of common findings, and issues to watch out for when auditing a contract for a mainnet launch.
• aragonOS: A smart contract framework for building DAOs, Dapps and protocols
  • Upgradeability: Smart contracts can be upgraded to a newer version
  • Permission control: By using the auth and authP modifiers, you can protect functionality so only other apps or entities can access it
  • Forwarders: aragonOS apps can send their intent to perform an action to other apps, so that intent is forwarded if a set of requirements are met
• EIP-2535 Diamond Standard
  • Organize contracts so they share the same contract storage and Ethereum address.
  • Solves the 24KB max contract size limit.
  • Upgrade diamonds by adding/replacing/removing any number of functions in a single transaction.
  • Upgrades are transparent by recording them with a standard event.
  • Get information about a diamond with events and/or four standard functions.
• Clean Contracts - A guide to writing clean code

Upgradeability

• Blog von Elena Dimitrova, Dev at colony.io
  • https://blog.colony.io/writing-more-robust-smart-contracts-99ad0a11e948
  • https://blog.colony.io/writing-upgradeable-contracts-in-solidity-6743f0eecc88
• Aragon research blog
  • Library driven development
  • Advanced Solidity code deployment techniques
• OpenZeppelin on Proxy Libraries

Infrastructure

Ethereum Clients

• Besu - an open-source Ethereum client developed under the Apache 2.0 license and written in Java. The project is hosted by Hyperledger.
• Geth - Go client
• OpenEthereum - Rust client, formerly called Parity
• Aleth - C++ client
• Nethermind - .NET Core client
• Infura - A managed service providing Ethereum client standards-compliant APIs
• Trinity - Python client using py-evm
• Ethereumjs - JS client using ethereumjs-vm
• Seth - Seth is an Ethereum client tool—like a "MetaMask for the command line"
• Mustekala - Ethereum Light Client project of Metamask
• Exthereum - Elixir client
• EWF Parity - Energy Web Foundation client for the Tobalaba test network
• Quorum - A permissioned implementation of Ethereum supporting data privacy by JP Morgan
• Mana - Ethereum full node implementation written in Elixir.
• Chainstack - A managed service providing elastic and dedicated Geth nodes
• QuickNode - Blockchain developer cloud with API access and node-as-a-service.
• Watchdata - Provide simple and reliable API access to Ethereum blockchain
• NOWNodes - Provide access to ETH node (and 48+ more) and Block Explorer. Get free API key to test blockchain-as-a-service solution
• Spice - Data and AI managed service, with SQL, API, and Node-as-a-Service.
• InfStones - Blockchain node service provider, with support for over 60 blockchain protocols.
• Chainnodes - Web3 Infrastructure provider with enterprise grade low latency for all. Supports all major EVM chains.

Storage

• IPFS - Decentralised storage and file referencing
  • Mahuta - IPFS Storage service with added search capability, formerly IPFS-Store
  • OrbitDB - Decentralised database on top of IPFS
  • JS IPFS API - A client library for the IPFS HTTP API, implemented in JavaScript
  • Moralis IPFS API - Upload mutliple files to IPFS easily in any language
  • TEMPORAL - Easy to use API into IPFS and other distributed/decentralised storage protocols
  • PINATA - The Easiest Way to Use IPFS
• Swarm - Distributed storage platform and content distribution service, a native base layer service of the Ethereum web3 stack
• Arweave - Decentralized and permanent storage
  • Bundlr - Arweave scaling solution with multiple token support
• Infura - A managed IPFS API Gateway and pinning service
• 3Box Storage - An api for user controlled, distributed storage. Built on top of IPFS and Orbitdb.
• Aleph.im - an offchain incentivized peer-to-peer cloud project (database, file storage, computing and DID) compatible with Ethereum and IPFS.
• DB3 Network - Decentralized Firebase Firestore Alternative.

Messaging

• Whisper - Communication protocol for DApps to communicate with each other, a native base layer service of the Ethereum web3 stack
• DEVp2p Wire Protocol - Peer-to-peer communications between nodes running Ethereum/Whisper
• Pydevp2p - Python implementation of the RLPx network layer
• 3Box Threads - API to allow developers to implement IPFS persisted, or in memory peer to peer messaging.
• EPNS SNS Notifications - SNS module for Push Delivery Nodes allows any developer to receive notifications, chats, or any other form of web3 communication directly to the platform they are building with the help of webhooks.

Distribution

• Meroku - A community owned dApp Store. Package, distribute your dApp without hosting costs.

Testing Tools

• Truffle Teams - Zero-Config continuous integration for truffle projects
• Solidity code coverage - Solidity code coverage tool
• Solidity coverage - Alternative code coverage for Solidity smart-contracts
• Solidity function profiler - Solidity contract function profiler
• Sol-profiler - Alternative and updated Solidity smart contract profiler
• Espresso - Speedy, parallelised, hot-reloading solidity test framework
• Eth tester - Tool suite for testing Ethereum applications
• Cliquebait - Simplifies integration and accepting testing of smart contract applications with docker instances that closely resembles a real blockchain network
• Hevm - The hevm project is an implementation of the Ethereum virtual machine (EVM) made specifically for unit testing and debugging smart contracts
• Ethereum graph debugger - Solidity graphical debugger
• Tenderly CLI - Speed up your development with human readable stack traces
• Solhint - Solidity linter that provides security, style guide and best practice rules for smart contract validation
• Ethlint - Linter to identify and fix style & security issues in Solidity, formerly Solium
• Decode - npm package which parses tx's submitted to a local testrpc node to make them more readable and easier to understand
• truffle-assertions - An npm package with additional assertions and utilities used in testing Solidity smart contracts with truffle. Most importantly, it adds the ability to assert whether specific events have (not) been emitted.
• Psol - Solidity lexical preprocessor with mustache.js-style syntax, macros, conditional compilation and automatic remote dependency inclusion.
• solpp - Solidity preprocessor and flattener with a comprehensive directive and expression language, high precision math, and many useful helper functions.
• Decode and Publish – Decode and publish raw ethereum tx. Similar to https://live.blockcypher.com/btc-testnet/decodetx/
• Doppelgänger - a library for mocking smart contract dependencies during unit testing.
• rocketh - A simple lib to test ethereum smart contract that allow to use whatever web3 lib and test runner you choose.
• pytest-cobra - PyTest plugin for testing smart contracts for Ethereum blockchain.
• Synpress - Web3-enabled e2e testing tool. A wrapper around Cypress.io with included MetaMask support which allows you to test dapps with ease.

Security Tools

• MythX - Security verification platform and tools ecosystem for Ethereum developers
• Mythril - Open-source EVM bytecode security analysis tool
• Oyente - Alternative static smart contract security analysis
• Securify - Security scanner for Ethereum smart contracts
• SmartCheck - Static smart contract security analyzer
• Ethersplay - EVM disassembler
• Evmdis - Alternative EVM disassembler
• Hydra - Framework for cryptoeconomic contract security, decentralised security bounties
• Solgraph - Visualize Solidity control flow for smart contract security analysis
• Manticore - Symbolic execution tool on Smart Contracts and Binaries
• Slither - A Solidity static analysis framework
• Adelaide - The SECBIT static analysis extension to Solidity compiler
• solc-verify - A modular verifier for Solidity smart contracts
• Solidity security blog - Comprehensive list of known attack vectors and common anti-patterns
• Awesome Buggy ERC20 Tokens - A Collection of Vulnerabilities in ERC20 Smart Contracts With Tokens Affected
• Free Smart Contract Security Audit - Free smart contract security audits from Callisto Network
• Piet - A visual Solidity architecture analyzer
• Smack My Contract - Web3 Security Scanner Aggregator

Monitoring

• Moralis Streams API - Stream real-time on-chain events to your webhook from multiple EVM blockchains.
• Alethio - An advanced Ethereum analytics platform that provides live monitoring, insights and anomaly detection, token metrics, smart contract audits, graph visualization and blockchain search. Real-time market information and trading activities across Ethereum's decentralized exchanges can also be explored.
• amberdata.io - Provides live monitoring, insights and anomaly detection, token metrics, smart contract audits, graph visualization and blockchain search.
• Neufund - Smart Contract Watch - A tool to monitor a number of smart contracts and transactions
• Scout - A live data feed of the activities and event logs of your smart contracts on Ethereum
• Tenderly - A platform that gives users reliable smart contract monitoring and alerting in the form of a web dashboard without requiring users to host or maintain infrastructure
• Chainlyt - Explore smart contracts with decoded transaction data, see how the contract is used and search transactions with specific function calls
• BlockScout - A tool for inspecting and analyzing EVM based blockchains. The only full featured blockchain explorer for Ethereum networks.
• Terminal - A control panel for monitoring dapps. Terminal can be used to monitor your users, dapp, blockchain infrastructure, transactions and more.
• Ethereum-watcher - An extensible framework written in Golang for listening to on-chain events and doing something in response.
• Alchemy Notify - Notifications for mined and dropped transactions, gas price changes, and address activity for desired addresses.
• Blocknatve Mempool Explorer — Monitor any contract or wallet address and get streaming mempool events for every lifecycle stage — including drops, confirms, speedups, cancels, and more. Automatically decode confirmed internal transactions. And filter exactly how you want. Receive events in our visual, no-code, interface or associate them with your API key to get events via a webhook. Mempool Explorer helps exchanges, protocols, wallets, and traders monitor and act on transactions in real-time.
• Ethernal - Ethereum block explorer for private chain. Browse transactions, decode function calls, event data or contract variables values on your locally running chain.
• Forta - A decentralized monitoring network to detect threats and anomalies on DeFi, NFT, governance, bridges and other Web3 systems in real-time.
• InfStones BlockWatch - Set up alarms to monitor node status for resource utilization. Incorporate notifications for SMS, Slack, phone calls, and emails.
• Blocktorch - An obvservability platform for the decentralized stack. Get the big picture of all your smart contracts at a glance. Browse through logs across chains and across contracts fast. Set Service Level Objectives to see and get notified about anomalies.
• Ethereum-datafarm - Easy-to-use console app for parsing historical event data without requiring an archive node. Ethereum-datafarm uses the Etherscan API to parse event data from specified contracts and store it in CSV format.
• Sidekik - Debug, test, and grok smart contracts with a visual UI that lets you interact with local or deployed EVM-based smart contracts. Easily monitor and browse local chain transactions, decode function calls, and prepare input payloads so you can test your code.

Other Miscellaneous Tools

• aragonPM - a decentralized package manager powered by aragonOS and Ethereum. aragonPM enables decentralized governance over package upgrades, removing centralized points of failure.
• Truffle boxes - Packaged components for building DApps fast.
  • Cheshire - A local sandbox implementation of the CryptoKitties API and smart contracts, available as a Truffle Box
• Solc - Solidity compiler
• Sol-compiler - Project-level Solidity compiler
• Solidity cli - Compile solidity-code faster, easier and more reliable
• Solidity flattener - Combine solidity project to flat file utility. Useful for visualizing imported contracts or for verifying your contract on Etherscan
• Sol-merger - Alternative, merges all imports into single file for solidity contracts
• RLP - Recursive Length Prefix Encoding in JavaScript
• eth-cli - A collection of CLI tools to help with ethereum learning and development
• Ethereal - Ethereal is a command line tool for managing common tasks in Ethereum
• Eth crypto - Cryptographic javascript-functions for Ethereum and tutorials to use them with web3js and solidity
• Parity Signer - mobile app allows signing transactions
• py-eth - Collection of Python tools for the Ethereum ecosystem
• truffle-flattener - Concats solidity files developed under Truffle with all of their dependencies
• Decode - npm package which parses tx's submitted to a local testrpc node to make them more readable and easier to understand
• TypeChain - Typescript bindings for Ethereum smartcontracts
• EthSum - A Simple Ethereum Address Checksum Tool
• PHP based Blockchain indexer - allows indexing blocks or listening to Events in PHP
• Purser - JavaScript universal wallet tool for Ethereum-based wallets. Supports software, hardware, and Metamask -- brings all wallets into a consistent and predictable interface for dApp development.
• Node-Metamask - Connect to MetaMask from node.js
• Solidity-docgen - Documentation generator for Solidity projects
• Ethereum ETL - Export Ethereum blockchain data to CSV or JSON files
• prettier-plugin-solidity - Prettier plugin for formatting Solidity code
• Unity3dSimpleSample - Ethereum and Unity integration demo
• Flappy - Ethereum and Unity integration demo/sample
• Wonka - Nethereum business rules engine demo/sample
• Sol2UML Unified Modeling Language (UML) class diagram generator for Solidity contracts
• Resolver-Engine - A set of tools to standardize Solidity import and artifact resolution in frameworks.
• eth-reveal - A node and browser tool to inspect transactions - decoding where possible the method, event logs and any revert reasons using ABIs found online.
• Ethereum-tx-sender - A useful library written in Golang to reliably send a transaction — abstracting away some of the tricky low level details such as gas optimization, nonce calculations, synchronization, and retries.
• truffle-plugin-verify - Seamlessly verify contract source code on Etherscan from the Truffle command line.
• Blocknative Gas Platform — Gas estimation for builders, by builders. Gas Platform harnesses Blocknative's real-time mempool data infrastructure to accurately and consistently estimate Ethereum transaction fees. This provides builders and traders with an up-to-the-moment gas fee API.
• ETH Gas.watch - A gas price watcher with email notifications on price change
• Diverse Eth Calculator - Ease unit calculations & utility tools. PWA , so you can install it on your mac/windows/linux or android/iphone
• Cookbook - A platform aggregating all smart contract libraries
• Ethereum Unit Converter - Online tool to convert the different Ethereum denominations (wei, gwei, ether).
• Solidity Bytes32 Converter - Online tool to convert Solidity Bytes32 into strings, or numbers and vice versa.

Smart Contract Standards & Libraries

ERCs - The Ethereum Request for Comment repository

• Tokens
  • ERC-20 - Original token contract for fungible assets
  • ERC-721 - Token standard for non-fungible assets
  • ERC-777 - An improved token standard for fungible assets
  • ERC-918 - Mineable Token Standard
• ERC-165 - Creates a standard method to publish and detect what interfaces a smart contract implements.
• ERC-725 - Proxy contract for key management and execution, to establish a Blockchain identity.
• ERC-173 - A standard interface for ownership of contracts

Popular Smart Contract Libraries

• Zeppelin - Contains tested reusable smart contracts like SafeMath and OpenZeppelin SDK library for smart contract upgradeability
• cryptofin-solidity - A collection of Solidity libraries for building secure and gas-efficient smart contracts on Ethereum.
• Modular Libraries - A group of packages built for use on blockchains utilizing the Ethereum Virtual Machine
• DateTime Library - A gas-efficient Solidity date and time library
• Aragon - DAO protocol. Contains aragonOS smart contract framework with focus on upgradeability and governance
• ARC - an operating system for DAOs and the base layer of the DAO stack.
• 0x - DEX protocol
• Token Libraries with Proofs - Contains correctness proofs of token contracts wrt. given specifications and high-level properties
• Provable API - Provides contracts for using the Provable service, allowing for off-chain actions, data-fetching, and computation
• ABDK Libraries for Solidity - Fixed-point (64.64 bit) and IEEE-754 compliant quad precision (128 bit) floating-point math libraries for Solidity
• Cookbook - A platform aggregating all smart contract libraries

Developer Guides for 2nd Layer Infrastructure

Scalability

Payment/State Channels

• Ethereum Payment Channel - Ethereum Payment Channel in 50 lines of code
• µRaiden Documentation - Guides and Samples for µRaiden Sender/Receiver Use Cases

Plasma

• Learn Plasma - Website as Node application that was started at the 2018 IC3-Ethereum Crypto Boot Camp at Cornell University, covering all Plasma variants (MVP/Cash/Debit)
• Plasma MVP - OmiseGO's research implementation of Minimal Viable Plasma
• Plasma MVP Golang - Golang implementation and extension of the Minimum Viable Plasma specification
• Plasma Guard - Automatically watch and challenge or exit from Omisego Plasma Network when needed.
• Plasma OmiseGo Watcher - Interact with Plasma OmiseGo network and notifies for any byzantine events.

Side-Chains

• POA Network
  • POA Bridge
  • POA Bridge UI
  • POA Bridge Contracts
• Loom Network
• Matic Network

Privacy / Confidentiality

ZK-SNARKs

• ZoKrates - A toolbox for zkSNARKS on Ethereum
• The AZTEC Protocol - Confidential transactions on the Ethereum network, implementation is live on the Ethereum main-net
• Nightfall - Make any ERC-20 / ERC-721 token private - open source tools & microservices
• Proxy Re-encryption (PRE)
• NuCypher Network - A proxy re-encryption network to empower data privacy in decentralized systems
• pyUmbral - Threshold proxy re-encryption cryptographic library
• Fully Homomorphic Encryption (FHE)
• NuFHE - GPU accelerated FHE library

Scalability + Privacy

ZK-STARKs

• StarkWare and StarkWare Resources - StarkEx scalability engine storing state transitions on-chain

Prebuilt UI Components

• aragonUI - A React library including Dapp components
• components.bounties.network - A React library including Dapp components
• ui.decentraland.org - A React library including Dapp components
• dapparatus - Reusable React Dapp components
• Metamask ui - Metamask React Components
• DappHybrid - A cross-platform hybrid hosting mechanism for web based decentralised applications
• Nethereum.UI.Desktop - Cross-platform desktop wallet sample
• eth-button - Minimalist donation button
• Rimble Design System - Adaptable components and design standards for decentralized applications.
• 3Box Plugins - Drop in react components for social functionality. Including comments, profiles and messaging.