Conquer-Space.net
Conquer-Space.net is a browser-based realtime strategy game with massive multiplayer support. You can find the (german) homepage at http://www.conquer-space.net. In the last couple of months, we have put significant effort into improving the quality with extensive unit testing. At the time of this writing (20. Sep 2005), we have 394 unit tests covering 21 classes. The net.cqs.engine.base package has 100% test coverage.
Find it at http://www.conquer-space.net/.
Casus Belli
An arcade-style multiplayer flight fighting game (for up to 4 players). No single player mode and just a single "map". It was written entirely in FreePascal.
Find it at http://ulf.ofahrt.de/casusbelli/.
4k Games
Find them at http://ulf.ofahrt.de/4kgames/.