AWStats Log Analyzer
An open source Mac OSX RSS reader with support for RSS/Atom feeds
The Free / Libre / Open Source Web App with the most built-in features
Audio converter and CD ripper for various formats
eLearning XHTML editor
Domination is a game that is a bit like the board game Risk
Take your office and CRM into the cloud!
A planetarium software that shows a 3D simulation of the night sky
Award-winning lightweight Open Source Content Management System (CMS)
Standalone chat system developed in php, mysql and javascript
Streams many media formats with minimal configuration
...a powerful, fast and reliable backup & sync tool.
A free sing-along karaoke game for your PC
Collabtive is web based project management software. Simple and easy.
Wikipedia offline & more
Localization tools built by localizers for localizers
Gramps, the open source genealogy program