Cannon Smash
A free and open source 3D ping-pong game based on OpenGL. (GNU GPL)
CarWorld driving simulator
Small driving simulator/demo with open source code
Danger from the Deep
Danger from the deep (aka dangerdeep) is a Free / Open Source World War II german submarine simulation. [Linux / Windows] (C++)
FlightGear Flight Simulator
Open source flight simulator under GPL licence for Windows, Linux, Mac OS-X, FreeBSD, SUN/Solaris, and SGI/IRIX platforms.
glChess - A 3D chess interface
An open source 3D chess interface. It uses OpenGL and GtkGLArea (from GTK+) for UNIX platform.
Possible Worlds
subwar / wing Commander - style openGL accelerated 3D game that runs both under Linux and Win 9x / NT / 2k.
S3D Connector
Online game finder and ELO ladder ranking for Sea3D Windows based 3-dimensional Settlers software.
Space Invaders OpenGL
OpenGL game with source code available. For Windows 9x/ME/NT/2000/X
The Blue Mango Quest
3D arcade game written in C/C++ and using openGL. The goal is to extend the pacman-style gameplay. This game runs both on Linux and win32 platforms and is released under the GPL Li…
The Ur-Quan Masters
Multi-platform port based on the now public-domain source-code of Star Control II.
Tuxedo T. Penguin: A Quest for Herring.
A free and open source 3D game, that uses OpenGL, which is staring the famous penguin Tux from Linux. (GNU GPL)
Vega Strike
Describes space simulation in which players trade and bounty hunt. Includes features, forum, manual, and downloads of beta versions