For 0.8.x :
For 0.7.x :
C
Native C library with Consumer, Producer and compression support.
https://github.com/edenhill/librdkafka
Maintainer: Magnus Edenhill
License: 2-clause BSD
Erlang
erlkafka is a kafka client written in erlang
https://github.com/milindparikh/erlkafka.git
Maintainer: Milind Parikh
*License: BSD, LGPL
PHP
PHP library with Consumer (simple and Zookeeper-based), Producer and compression support (release notes).
https://github.com/quipo/kafka-php
Maintainer: Lorenzo Alberton
License: Apache v.2.0
Python
Low-level protocol support in Python.
https://github.com/mumrah/kafka-python
Maintainer: David Arthur
License: Apache v.2.0
Node.js
Low-level protocol support in node.js.
https://github.com/cainus/Prozess
https://npmjs.org/package/prozess
Maintainer: Gregg Caines
License: MIT
Client Libraries Previously Supported
https://svn.apache.org/repos/asf/incubator/kafka/branches/legacy_client_libraries