EAISoul
JFusion 
Supercharge your Joomla! site. Integrate almost any software into Joomla! and allow your users single logins. Now get full control over integrating multiple softwares at the same time, with the new master/slave capabilities. JFusion is a free GPL plugi ...
Download Plugin for SOBI2
The SOBI2 Download Plugin extends SOBI2 to a document management and download system. With this plugin it is easy to create a download directory or a documents directory using SOBI2. It allows adding an unlimited number of files to every entry. The n ...
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 ...
pollXT
pollXT is most likely the most used poll extension for Joomla!. Originally based on the standard Joomla! poll it provides an incredible amount of additional features like: * highly configurable polls: o unlimited questions o ...