Kunena is a popular forum extension for Joomla that integrates with the Joomla user system.
Kunena is a forum component for Joomla. The name Kunena is from a Swahili word meaning, "to speak". It was derived from the former Fireboard forum with new and previous developers that include several Joomla core developers. The developers have a long term goal to redesign Kunena from the ground up to take full advantage of what Joomla has to offer.
There is no company behind Kunena; everyone who contributes to Kunena is a hobbyist, enthusiast or professional web developer who gives their time freely to this project.
The current version as of July 2014 is Kunena 3.0.6. It is available for Joomla 2.5 and 3.x, and Joomla 3 users can install Kunena directly from the Joomla Extension Manager (Web installer). It is also available for downloaded at http://www.kunena.org/download, as well as several modules and plugins to extend the functionality of Kunena.