EC-Laby is a small net-game with 2 teams of players running through a labyrinth to find the startroom of the other team. The first team which reaches the other startroom wins. There are features like chatting with other players and collecting points, and abilities to view a lab-map, set orientation points, insert oneways in the labyrinth, beam to other players, and insert question-doors in the labyrinth.
Particle Simulation is a playful simulation game which allows you to spray particles into the "air". The number of simulated particles is only limited by the speed of your computer. The particles don't interact with each other, but will bounce back from the ground and accelerate depending on a gravity constant. This constant can be changed (along with a number of other parameters) in the source code or via commandline parameters.
The Airbus A340 Glass Cockpit project is an intiative of the IRADIS foundation. It uses the glass cockpit library libGC developed for this project, which provides an open interface to the rest of the flight simulator and contains a framework designed for easy development of a glass cockpit.
XPilot is a graphical multi-player maneuvering game with less-exciting graphics, but more speed, tactics, and insults. Some people also use it for UDP network analysis. Over the past eight years of playing and development, tons of features have been added to the game, from basic weapons like shotguns and missiles to more recent ones like phasing devices, invisibility, or hyperjump.