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Native C++ library with protocol support for Metadata, Produce, Fetch, and Offset.

Maintainer: David Tompkins
License: Apache 2.0

https://github.com/adobe-research/libkafka

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C++ Header-only Kafka Client Library using Boost Asio

Maintainer: Daniel Joos
License: MIT

https://github.com/danieljoos/libkafka-asio

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A C++11 asyncronous producer/consumer library for Apache Kafka based on boost asio

Maintainer: Svante Karlsson
License: Boost Software License - Version 1.0

https://github.com/bitbouncer/csi-kafka

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libasynckafkaclient - C++ based single threaded asynchronous library

Maintainer: Vijay Jadhav
License: 2-clause BSD

https://github.com/GSLabDev/libasynckafkaclient

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https://github.com/quipo/kafka-cpp

Kafka Version: 0.7.x

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Pure Python implementation with full protocol support. Consumer and Producer implementations included, GZIP, LZ4, and Snappy compression supported.

http://github.com/dpkp/kafka-python

Kafka Version: 0.8.x, 0.9.x, 0.10.x, 0.11.x, 1.0.x

Maintainer: Dana Powers
License: Apache 2.0

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Python driver with full protocol support, Pythonic API, and managed balanced consumer implementation.
https://github.com/Parsely/pykafka
Kafka Version: 0.8.x,0.9.x,0.10.x
Maintainer: Parse.ly
License: Apache 2.0

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Protocol support for Kafka 0.7 in Python. GZip and Snappy compression supported

Kafka Version: 0.7.x

Maintainer: David Arthur
License: Apache v.2.0

https://github.com/mumrah/kafka-python/tree/0.7

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Also:
https://github.com/dsully/pykafka

Kafka Version: 0.7.x

Maintainer:: Dan Sulley, LinkedIn
License: Apache 2.0

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Python client from Disqus:
https://github.com/getsamsa/samsa

Kafka Version: 0.7.x

Maintainer:: Keith Bourgoin, Parse.ly
License: Apache 2.0

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Python client from Urban Airship: https://github.com/urbanairship/pykafkap

Kafka Version: 0.7.x

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Python client from Datadog: https://github.com/datadog/brod
(Producer, Simple Consumer, ZK-Consumer)

Kafka Version: 0.7.x

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A minimal, high-performance Kafka client in Erlang

https://github.com/helpshift/ekaf

Kafka Version: 0.8.x

Maintainer: Helpshift
License: Apache v2

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erlkafka is a kafka client written in erlang

https://github.com/milindparikh/erlkafka.git

Kafka Version: 0.7.x

Maintainer: Milind Parikh
*License: BSD, LGPL

Also:
https://github.com/wooga/kafka-erlang

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A fully featured .NET client for Apache Kafka based on librdkafka (a fork of rdkafka-dotnet).

Kafka Version: 0.8.x, 0.9.x, 0.10.x, 0.11.x

Maintainer: Confluent Inc. (original author Andreas Heider)

License: Apache 2.0

https://github.com/confluentinc/confluent-kafka-dotnet

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Pure C# client with full protocol support.  Includes consumer, producer,

lower level components and gzip support (no snappy)

Kafka Version: 0.8.x

Maintainer: James Roland 

License: Apache 2.0

https://github.com/Jroland/kafka-net

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This is a .NET implementation of a client for Kafka using C# for Kafka 0.8. It provides for an implementation that covers most basic functionalities to include a simple Producer and Consumer.

Kafka Version: 0.8.x

Maintainer: ExactTarget

License: Apache 2.0

https://github.com/ExactTargetDev/kafka-net

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.Net implementation of the Apache Kafka Protocol that provides basic functionality through Producer/Consumer classes. The project also offers balanced consumer implementation. The project is a fork from ExactTarget's Kafka-net Client.

Kafka Version: 0.8.x, 0.9.x

Maintainer: Microsoft

License: Apache 2.0

https://github.com/Microsoft/Kafkanet

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C# client, asynchronous, all 3 compressions supported (read and write), tracks leader partition changes transparently, long time in production.

Kafka Version: 0.8.x

Maintainer: Vadim Chekan
License: Apache-2.0
https://github.com/ntent-ad/kafka4net

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kafka-sharp - "High Performance" .NET Kafka Driver

Kafka Version: 0.8.x

Maintainer: Criteo

License: Apache 2.0

https://github.com/criteo/kafka-sharp

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kafunk - Fully-featured, native F# client which works on .NET Core

Kafka Version: 0.8.x, 0.9.x, 0.10.x

Maintainer: Jet.com

License: Apache 2.0

https://github.com/jet/kafunk

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Clojure

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Fast kafka api for JVM languages implemented in clojure.

Kafka Version: 0.8.x

Maintainer: https://github.com/gerritjvv

License: Apache 2.0

https://github.com/gerritjvv/kafka-fast

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Wrapper to the Java API for interacting with Kafka

Kafka Version: 0.8.x

Maintainer: https://github.com/pingles

License: Apache 2.0

https://github.com/pingles/clj-kafka/ 

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Kafka clojure client library

Kafka Version: 0.8.x

Maintainer: Pierre-Yves Ritschard

License: MIT

Code, Documentation

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Ruby

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Karafka - Ruby and Rails multi-threaded efficient Kafka processing framework. Based on librdkafka.

Kafka Version: 1.0+

Maintainer: Maciej Mensfeld

License: LGPL-3.0

https://github.com/karafka/karafka

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Racecar – A simple framework for writing Kafka consumers in Ruby that integrates nicely with Rails. Based on ruby-kafka. 

Kafka Version: 0.9.x, 0.10.x, 0.11.x

Maintainer: Zendesk / Daniel Schierbeck

License: Apache 2.0

https://github.com/zendesk/racecar

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DeliveryBoy – A simple way to publish messages to Kafka from Ruby applications. Based on ruby-kafka.

Kafka Version: 0.9.x, 0.10.x, 0.11.x

Maintainer: Zendesk / Daniel Schierbeck

License: Apache 2.0

https://github.com/zendesk/delivery_boy

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Node.js

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The node-rdkafka library is a high-performance NodeJS client for Apache Kafka that wraps the native librdkafka library. All the complexity of balancing writes across partitions and managing (possibly ever-changing) brokers should be encapsulated in the library.

https://github.com/Blizzard/node-rdkafka

Kafka Version: 0.9, 0.10

Node.js >= 4

Maintainer: Blizzard.com

License: MIT

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Kafka-Node is a NodeJS client with Zookeeper integration

Kafka Version: 0.8.x

Maintainer: sohu.com

License: MIT

https://github.com/SOHU-Co/kafka-node/

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Kafka-node is a pure JavaScript implementation for NodeJS Server with Vagrant and Docker support.

Kafka Version: 0.8.x

Maintainer: wurstmeister
License: Apache 2.0

https://github.com/wurstmeister/node-kafka-0.8-plus

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kafka-java-bridge is a Nodejs wrapper for the JAVA high level kafka 0.8. consumer API

Kafka Version: 0.8.x

Maintainer: LivePersonInc

License: MIT

https://www.npmjs.com/package/kafka-java-bridge

https://github.com/LivePersonInc/kafka-java-bridge

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Low-level protocol support in node.js.

https://github.com/cainus/Prozess
https://npmjs.org/package/prozess

Kafka Version: 0.7.x

Maintainers: 
Gregg Caines
Eric lee
License: MIT

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Alternate node client from Tagged
https://github.com/marcuswestin/node-kafka

Also:
https://github.com/dannycoates/franz-kafka

Kafka Version: 0.7.x

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