Extensions are installable packages which give CiviCRM new functionality, and this directory provides a centralized list of extensions which the CiviCRM community has created.

Further resources:

Allows you to map RSForm fields to CiviCRM contact fields.
Current Usage: 0
Authentication plugin for Joomla with access control and ACL group assignment features.
Current Usage: 0
This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
Current Usage: 0