Usermin is a Web interface that can be used by any user on a UNIX system to easily perform tasks like reading mail, setting up SSH, or configuring mail forwarding. It can be thought of as a simplified version of Webmin designed for use by normal users rather than system administrators.
isdn4net is a collection of scripts and configuration files to help you run isdn4linux. It is designed for fast setup of a simple dialout to one ISP, but may also be used for management of complex setups. It is intended for Mandrake systems, but if there is interest, it could be adapted to others as well.
Mondriaan produces a set of images that look a lot like the paintings of the artist Piet Mondriaan. By way of selection and genetic operators this set can be manipulated by you. You can try to find images that you think look even more like Mondriaan art, or search for images you find attractive.
TimeTracker puts up a list of projects, and the number of minutes worked on each. You click on the project you want to work on, and it starts counting on that. At the end of the day, it saves the collected data in a file, and you can use a script to process the data. The project has been idle for quite a while, and has spawned a host of imitations, including implementations of the same basic idea for Windows, PalmPilot, KDE, and various other contexts.