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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 2,000,000 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 ...
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 ...
JEvents
This well known and loved Events Calendar for Joomla. JEvents consists of a Joomfish compatible Joomla component and a number of modules and plugins. Component * One-off Events and complex repeating patterns of events can be created and view ...
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 ...