An Open Source portable pure Java game library with example games, Swing-based sprite animation engine, deployment framework, and firewall tunneling networking. The code is documented in the book Advanced Java Game Programming by David Wallace Croft.
MACTO, The Open Racing Car Simulator is a highly portable multi platform car racing simulation. It is used as ordinary car racing game, as multiplayer racing game. It's runing on Linux, Windows and MacOSX.
This is a 2D shooting action game for two players for GNU/Linux, Mac OS X, and Windows. Current release written in C++ using the SDL library with its extensions. Next release will be in Java.
JImola is a editor for racing sims developed under the ISI engine (GTR, GTL, rF, ...). It allows the user to change the AIW file (AI control, cutting, track borders, grid and pits info) in 3D without the hassle of editing a big text file.
ATCJ:
Air Traffic Controller Game, let you direct flights into and out of the flight arena and airports, written in Java, small and portable, based on the classical UNIX terminal based Air Traffic Controller Game (atc) created by Ed James.