WackoWiki is a light and easy to install multilingual Wiki-engine.
HTLS is an Hattrick live match viewer, based on the old Livefox.
Open source project management
A WebBased Collaboration OpenSource Tool
Database management in a single PHP file
Open source support tracking in your browser
phpwcms is a web content management system
Authoring and Learning management system
A free and open source screenshot tool optimized for productivity