osTicket is a widely-used open source support ticket system
This software is not reviewed yet.
The Super Cool Ecommerce Solution
The Amazing Little Poll is a very simple php polling script
The Original PHP and MySQL Forum Software
SimplePie is a very fast and easy-to-use class, written in PHP, that puts the simple back into really simple syndication.
Its the easy to use, multilingual, powerful, feature packed, free forum software