ownCloud provides universal access to files via a browser or WebDAV. Easily view and sync your contacts, calendars and bookmarks across all your devices and enables basic editing.
Subsonic is a web-based media streamer, providing ubiquitous access to your music. Use it to share your music with friends, or to listen to music while at work.
OrangeHRM offers a complete suite of human capital management / human resource management tools.
Popular web-based bug tracking system. It's lightweight and easy to use and deploy.
Wacko Wiki is a light and handy Wiki-engine.