The libmba package is a collection of mostly independent C modules potentially useful to any project. There are the usual ADTs including a linkedlist, hashmap, pool, stack, and varray, a flexible memory allocator, CSV parser, path canonicalization routine, I18N text abstraction, configuration file module, portable semaphores, condition variables, and more. The code is designed so that individual modules can be integrated into existing codebases rather than requiring the user to commit to the entire library. The code has no typedefs, few comments, and extensive man pages and HTML documentation.
GeekOS is a tiny operating system kernel for x86 PCs. Its goal is to be simple enough for beginners to understand and modify, but realistic enough to be interesting and fun. The primary development environment for GeekOS is Linux or Windows using gcc, nasm, and the Bochs PC emulator.
XMins is a distribution of the XWin server, a version of Xorg's X11 server that runs on Windows. It allows you to start an X server to access an XDMCP-enabled host or to launch remote applications. Its main advantage over the XWin server distributed by Cygwin is that it doesn't require the installation of Cygwin.
Marauder-ah is a set of improvements over "marauder", originally written by Shawn Hargreaves in 1994. You control a spaceship with a basic weapon, and your purpose is to kill as many people as you can. Earning money (using piracy or trade) enables you to upgrade your ship and buy deadly weapons.
KBall is a game of skill and reflexes suitable for all ages. The idea is to move a ball around the map without falling or running out of time, and getting the prizes, in order to reach the exit. The map has different traps, such as slides, pushers, jumps, falls, and walls, etc. Maps are viewed from top view, and the walls and player's ball are real-time rendered in beautiful 3D. There is a map editor available inside of the game, to make custom maps.