phobos
uddeIM 
uddeIM allows users of your community to send Private Messages to each other (note that uddeIM is not a webmail component nor an email client). uddeIM wants to be simple and easy-to-use but it offers all the features you need in a Private Messaging System ...
Kunena
Kunena - The leading Joomla Forum Component. Downloaded more than 1,850,000 times in 3 years since its start. The only forum/discussion solution for Joomla that is community driven. No hidden fees, no surprises - true open source. See our public forums, G ...
JCE 
An award-winning, configurable WYSIWYG editor for Joomla! based on Moxiecode's TinyMCE. Includes advanced Image/Media, File and Link handling, plugin support, and an Administration interface for editor configuration.
JoomGallery
JoomGallery is a gallery component completely integrated into Joomla!, with support for Joomla! 1.5.x and Joomla! 1.7.x. Features include, but are not limited to: - Three image sizes: Thumbnails - Detail images - Original images (thumbnails and deta ...
Community Builder
Community Builder (CB) extends the Joomla! members management system. Key features: extra fields in profile, enhanced registration workflows, user lists, connection paths between users, admin defined tabs and user profiles, image upload, front-end workflo ...
JoomLeague
We are very proud to present you the new joomleague version. After almost 3 years of development, we have a full MVC based Sports Management component for Joomla 1.5.x We are proud to announce that our 1.5.4 version has been launched on 04-01-2012 and ...