Cadaver is a simulated world of cyborgs and nature in realtime. The battlefield consists of forests, grain, water, grass, carcass (of course) and lots of other things. The game server manages the game and the rules. You start a server and connect some clients. The clients communicate with the server using a very primitive protocol. They can order cyborgs to harvest grain, attack enemies or cut forest. The game is not intended to be played by humans! Instead the idea is that you write artificial intelligence clients to beat the other artificial intelligences.
erikyyyphone is a very old internet audio conferencing application. The last version was december 1996. It has now been updated to nowadays library status and added autoconf+automake. Multiple persons can talk to each other. It uses very little bandwith and can handle network lags intelligently.
Tempest for Eliza is a program that uses your computer monitor to send out AM short wave radio signals. You can then hear computer generated music in your radio. it teaches you that your computer can be observed. Tempest for Eliza works with every monitor, every resolution. you don't have to be root.
Compilercache is a wrapper around your C and C++ compilers. Each time you compile something, it puts the result of the compilation into a cache. Once you compile the same thing again, with exactly the same command line parameters and exactly the same sources and included include files, the result will be picked from the cache instead of being recompiled.