Kunena is the leading Joomla forum component. Downloaded more than 3,000,000 times in 4 years since its start, Kunena is the only forum/discussion solution for Joomla that is community driven - true open source - public self-help forums, GitHub and documentation Wiki.
The most recent stable release, recommended for production websites running J! 2.5 and J! 3.1, is Kunena 3.0.0. This version supersedes K 2.0.
The essential differences between Kunena 3.0 and Kunena 2.0 are
* K 3.0 does not operate on J! 1.5 websites; and
* K 3.0 can only be installed on J! 2.5 and J! 3.x websites
Kunena 3.0 is a project that has been some ten months in the making. Among other things, the main design objectives for Kunena 3.0 were to remove many lingering legacy issues (caused by the requirement in older versions to maintain J! 1.5 websites) as well as to keep pace with current and emerging Joomla trends.
Details about Kunena 3.0.0 are contained in the release notes at http://www.kunena.org/docs/Kunena_3.0.0_Read_Me
For more details about the extent of features available in Kunena, please see http://www.kunena.org/docs/Kunena_Features