This list is for anyone wishing to learn about Apache Kafka, but do not have a starting point.
You can help by sending Pull Requests to add more information.
If you're not inclined to make PRs, you can tweet me at
Firehose - Firehose is an extensible, no-code, and cloud-native service to load real-time streaming data from Kafka to data stores, data lakes, and analytical storage systems.
Dagger - Dagger is an easy-to-use, SQL framework to process built on top of Apache Flink for stateful processing of Kafka data.
Raccoon - Raccoon is a high-throughput, low-latency service to collect events in real-time from your web, mobile apps, and services using multiple network protocols and publish to Kafka.
Stencil - Stencil is a Protobuf schema registry for Kafka that enables you to create, maintain and consume protobuf messages and APIs dynamically, efficiently, and reliably.
Meteor - Meteor is a scalable, easy-to-use, extensible metadata collection framework from the different cloud providers and on-prem sources and publish to Kafka.
Logit.io - Logit.io allows you to send logs and metrics from Kafka for centralised monitoring, alerting and analysis.
https://awesomeopensource.com/project/kafka-ops/kafka-topology-builder Gitops and Automation for Apache Kafka
Strimzi Operator for deploying and running Apache Kafka on Kubernetes and OpenShift
kafkacat Generic CLI non-JVM Apache Kafka producer and consumer
connectctl Manage kafka connect connectors easily
Kafdrop Web UI for browsing Kafka topics and consumer groups
KokpitBasic Kafka client that does publish subscribe and runs as a Windows application
Strimzi Kafka CLI A CLI for Strimzi Kafka Operator
Kowl A modern Kafka WebUI written in Go & React