Chipmunk C# - C# implementation of the Chipmunk2D lib. 🅾️
Chipmunk2D - A fast and lightweight 2D game physics library.
Cocos2D - graphic library for games and multimedia, for python language 🅾️
Cocos2d-x - a C++ OpenGL 2D and 3D game engine. Uses C++ but has JS and Lua bindings. 🆓
Construct 2 - an HTML5 game maker, meaning you are not actually writing JavaScript. Instead, you use actions, events and conditions to do the heavy lifting. 🚩
Coquette - A micro framework for JavaScript games. Handles collision detection, the game update loop, canvas rendering, and keyboard and mouse input.
Corona SDK - A Cross-Platform Mobile App Development for iOS and Android.
Phaser - free and fast 2D game framework for making HTML5 games for desktop and mobile web browsers, supporting Canvas and WebGL rendering.
PixiJS - is a newcomer HTML5 game renderer - first released in early 2013. A main appeal of the engine is its use of WebGL for faster performance. If WebGL isn't supported, the engine falls back to standard canvas.
Processing - Processing is a programming language, development environment for artists, designers, researchers.
PuzzleScript - open-source HTML5 puzzle game engine.
RPGMaker - series of programs for the development of role-playing games. 💲
Ren'Py - visual novel engine using the Python language in simplified form. It supports Windows, Mac OS X, Linux, Android and iOS 🅾️
SDL - SDL is a cross-platform library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. 🆓
Turbulenz - Turbulenz offers the ability to build, publish, iterate and monetise high-quality games that react like no others, with immersive 3D effects and real-time physics that open up a whole new world of unprecedented and extraordinary web content.
Unity 3D - A development engine for the creation of 2D and 3D games and interactive content.
Unreal Engine 4 - the new game engine technology developed by Epic Games.
Urho3D - Cross-platform rendering and game engine. 🅾️
AirConsole- Add controller support using broswer 🆓
ecs-lib - ecs-lib is a tiny and easy to use ECS (Entity Component System) library for game programming. It's written in Typescript but you can use on node.js and web browser too. 🅾️
kitlang - Kit is a programming language designed for creating concise, high performance cross-platform applications. 🅾️
Fusion Character Animator - small tool for Clickteam Fusion 2.5 to facilitate the animation of 2D character sprites for developers. 💲
ScreenToGif - record a selected area of your screen and save it as a Gif 🅾️
Spine - Spine is dedicated to 2D animation, providing an efficient workflow both for creating amazing animation and for integrating it into your games. 💲
DragonBones - The Open Source 2D skeleton animation solution for Flash 🅾️
LWF - Lightweight SWF. LWF is an animation engine which can play animation data converted from FLASH contents in HTML5, Unity, Cocos2d-x, iOS UIKit, and more. 🅾️
Audio Tools
Ardour - A multichannel digital audio workstation 🅾️
Audacity - cross-platform software for recording and editing sounds. 🅾️
Audiosauna - transforms your web browser into a fast and flexible music production studio with built in synthesizers and live effects.
MadTracker - a powerful and efficient approach to making music. Versatility and compatibility are guaranteed due to full VST™, ASIO™ and ReWire™ support.
Musagi - fairly large and sophisticated music editor and synthesizer 🅾️
PulseBoy web-based musical sequencer which only uses 8bit sounds and samples 🆓
Rosegarden - music composition and editing environmen 🅾️
Pixen - Pixel Art Editor for OSX (Warning: Pixen previously did not support custom gif palettes before becoming paid, and may still have this limiation.) 💲
PyxelEdit - Pixel art editor designed to make it fun and easy to make tilesets, levels and animations. 💲
Tiled - free, easy to use and flexible tile map editor. 🆓
Vector/Image Editor
Gimp - GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. 🅾️
Krita - Sketching and painting, offering an end-to-end solution for creating digital painting files from scratch by masters. 🅾️
Paint.NET - Paint.NET is free image and photo editing software for PCs that run Windows. 🆓
Pixelmator - Full-featured image editing app for the Mac
Affinity Designer - Professional graphic design software, easy to use and fast 💲