Magellan puts pictures of the world (or of any other sphere) on your desktop.
It will handle any number of different map projections, and will output to the X root window, or to a bitmap file. It can render multiple projections to a single output, and is fully configurable, with a modular design to allow plugins for alternative output methods and projections.
Calliope is a video recorder for DVB systems. It currently features a simple AJAX web-based UI, and supports TV tuners placed on arbitrary machines on the local network.
At the moment, it's in a very rough state, but appears to be functional for the purposes of making recordings. There's little or no documentation on how to set it up -- if you want to try it out and can't work out what all the bits do, mail me.
Egregium is a first-person shooter, harking back to the days of the 8-bit micro.