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:

Click & Pledge Payment Processor for CiviCRM. References:     Online Manual     User Forum & Support ...
Current Usage: 13
The Click & Pledge Payment Gateway plugin allows you to accept online payments in your Joomla CiviCRM. Download the CiviCRM & Click & Pledge Payment Gateway Extension and start accepting payments from all major brands with your Click & Pledge account: Visa,American Express,Discover,MasterCard....
Current Usage: 13
This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
unknown
Allows you to map RSForm fields to CiviCRM contact fields.
unknown
Authentication plugin for Joomla with access control and ACL group assignment features.
unknown