TightVNC is a VNC distribution with many new features, improvements, and bugfixes over VNC. It is optimized for faster operation on slow network links such as modem connections, provides more configuration options in the server, features automatic SSH tunneling in the Unix vncviewer, and more. The modified servers and viewers are fully compatible with the original VNC software.
Tile World is an emulator of "Chip's Challenge", a popular game created for the Atari Lynx and later ported to MS Windows 3.x. "Chip's Challenge" is a tile-based game, demanding complex puzzle-solving and occasionally quick reflexes. Tile World, in addition to bringing the game to modern OSes, provides emulation of the Atari Lynx version in addition to the more well-known Windows version of the game. It also deals with user-created levels intelligently, and provides game-saving features, customization, etc.
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.