JSBSim is a multi-platform flight dynamics model. The FDM is essentially the physics/math model that defines the movement of an aircraft under the forces and moments applied to it using the various control mechanisms and from the forces of nature. JSBSim has no native graphics. It can be run by itself as a standalone program, taking input from a script file and various aircraft configuration files, or it can be run as an integrated part of a larger flight simulator implementation that includes a visual system. The most notable usage example is the FlightGear simulator. JSBSim models the aerodynamic forces and moments by the classic coefficient buildup method.
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.
ZapM is a sci-fi rogue-like game that borrows monsters and ideas from all over and crams them into a ridiculous and perilous space maze where even a toaster can kill you. But the intrepid hero, a badass space marine (or perhaps you're playing as a skilled software engineer, or a plucky quarterback, or a mutant psion?), has no choice but to enter this dangerous hulk and search for the legendary "Bizarro Orgasmatron", the only artifact that can save the universe from certain destruction!
Quarters is a strategy game for two players. Although its rules are relatively simple, it still offers some of the same opportunities for skill as in chess. This program was originally conceived in the summer of 1986 during a study of the mini-max algorithm for chess playing computers, and was thus designed to offer some of the same type of strategies. The game was originally written in BASIC, then ported to Turbo Pascal, then to C, and finally to Java. The Java version is not necessarily object oriented, since it is a crude port from the C version.
Tanky is a tank shooting game with old-school graphics (lines and flying pixels in 16 colors). It can be played by 2-3 players on one keyboard. The main goal is to shoot your opponents down. You have one tank, five shots, and a shield which can take five points of damage. Every time, there are different bonuses flashing around. Collect them and gain faster weapons, more shots, recharge your shield, etc. The best-scored player wins.
Vavoom is a DOOM source port incorporating Doom, Heretic, Hexen, and a little bit of Quake. It runs on DOS, Windows, and Linux and includes many advanced features like OpenGL and Direct3D support, translucency, freelook, jumping, a client/server architecture with in-game joining, a Quake-style console, a powerful language to describe game logic (Vavoom C), and much more.