FlightGear is an open-source, multi-platform flight simulator.

Future Pinball is a real time Pinball Development System. It allows you to design and play your very own pinball simulation in True real time 3D.

XBoard and WinBoard are graphical user interfaces for chess. They display a chessboard on the screen, accept moves made with the mouse, and load and save games in Portable Game Notation (PGN).

Vega Strike is an Open Source 3D Action-Space-Sim that lets you trade, fight, and explore in a vast universe. Vega Strike is built on top of OpenGL and runs on Win/Lin/Mac platforms.

Yoda Soccer is a project which intends to create a new free game for Windows with the gameplay and the style of the well known Sensible World of Soccer. Yoda Soccer runs on Win/Lin/Mac platforms.

BillardGL is an OpenGL pool billiard simulation, which was developed within the scope of our course "Computergraphics" at the University of Freiburg (Germany). BillardGL is puplished under the GPL and is available for download for Windows, Linux and Mac platforms.

xrick is a clone of Rick Dangerous, known to run on Linux, Windows, BeOs, Amiga, QNX. Back in the 1980's and early 1990's, Rick Dangerous was the Indiana Jones of computer games, running away from rolling rocks, avoiding traps, from South America to a futuristic missile base via Egypt and the Schwarzendumpf castle.

Scorched 3D is a game based on the classic DOS game Scorched Earth "The Mother Of All Games", an artillery game with two+ tanks taking turns to destroy opponents in an arena. Choose the angle, direction and power of each shot, launch your weapon, and try to blow up other tanks. Scorched 3D is totally free and is available for both Microsoft Windows and Unix (Linux, FreeBSD, Mac OS X, Solaris etc.) operating systems.

Smokin' Guns WesternQuake3 is intended to be a realistic simulation of the "Old West's" great atmosphere. It is being developed on id Software's Quake3 Arena Engine. Works on Windows, Linux and Mac.

gridwars by Mark Incitti, is a freeware game for PC, Mac and Linux. In Gridwars you operate a spacecraft repulsing attacks of aggressive geometrical figures.

No Gravity is a fantastic and futuristic universe made of five intergalactic worlds. An arcade type game with great playability, where it is easy to plunge into space battles against spacefighters, space stations and more ! No Gravity Works on Windows, Linux and Mac.

Danger from the Deep is a free (as in free speech), Open Source World War II german submarine simulator. There are binarys available for Linux (i386 and amd64), Windows (32bit) and there are some old packages for MacOSX.

World of Padman developed and headed by the professional cartoonist and illustrator ENTE, the Team behind World of Padman (WoP) proudly present A FREE multiplayer standalone GAME for Windows, MacOS, and Linux that's powered by an extended Quake3-Engine based on the source of ioquake3.