Automatic LAMP (Linux, Apache, MySQL and PHP) In about 15 minutes, the time it takes to install Ubuntu Edgy Server Edition, you can have a LAMP server up and ready to go. This feature, exclusive to Ubuntu Server Edition, is available at the time of installation.
Scibuntu , Ubuntu Linux for scientists and science students. Scibuntu is not just another Linux distribution. It is a script that adds scientific programs and other convinient tools to the plain desktop Ubuntu.
apt-spy is a program that tests a series of Debian archive mirrors for bandwith.It writes an /etc/apt/sources.list with the fastest server.You can select which of the many Debian sites to benchmark by geographical location.
Amarok is a sound system-independent audio-player for *nix systems. Its interface uses a powerful "browser" metaphor that allows you to create playlists that make the most of your music collection.
FreeNX is a system that allows you to access your desktop from another machine over the internet. You can use this to login graphically to your desktop from a remote location. One example of its use would be to have a FreeNX server set up on your home computer, and graphically logging in to the home computer from your work computer, using a FreeNX client.
WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time.