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.
Zenphoto is a standalone gallery CMS that just makes sense and doesn't try to do everything and your dishes.
RainLoop webmail application has a modern user interface to handle large number of email accounts without the need of any database connectivity
Network File System (NFS) allows the HDA to share directories and files with others over a network. You can access files on remote systems like they are local.
Mediatomb is an UPnP MediaServer that allows you to stream your digital media through your home network using a variety of UPnP compatible devices.
HTPC Manager combines all your favorite software into one slick interface. Do all your HTPC tasks without using 5 different interfaces!