Freedroid consists of two open-source games: FreedroidRPG and FreedroidClassic. FreedroidRPG is an isometric role playing game. FreedroidClassic is a 2D arcade game.
Speed Dreams is a 3d cross-platform, open source motorsport simulation and racing game. It is released under the GNU General Public License (GPL). For the moment, the supported platforms are Linux (x86, x86_64) and 32 bit Windows. The Mac OS X port is 95% finished.
There is a patch for Wing Commander Saga Darkest Dawn.. if u need it. While Mac and linux version are still being worked on, linux users can play the game using wine according to this article.
Wing Commander Saga: The Darkest Dawn has been in development for a decade. Wing Commander Saga: The Darkest Dawn is a free, standalone total conversion project for PC and Mac based on the Freespace 2 Source Code project. Taking place during the time of Wing Commander 3, Wing Commander Saga: The Darkest Dawn features 55 missions, various achievements, over 11,000 lines of dialogue, resulting in over nine hours full voice acting, approximately 70 cut scenes for a total of about 90 minutes of pre-rendered footage (not counting in-flight communications and command briefings), 221 voice acting roles, and more.
Eclipse Origins Game Engine is an 2D MMORPG Maker. This little beauty can be used to create an online RPG (aka, MMORPG) all by itself. It has everything you could possibly need – and it’s open source! If you find that Origins doesn’t have everything you need then you can simply pop it open in Visual Basic 6.0 and get to work adding in your own exciting systems.
Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux. The project is geared towards providing addictive arena shooter gameplay which is all spawned and driven by the community itself. Xonotic is a direct successor of the Nexuiz project with years of development between them, and it aims to become the best possible open-source FPS (first-person-shooter) of its kind.
OpenArena is an open-source content package for Quake III Arena licensed under the GPL, effectively creating a free stand-alone game. You do not need Quake III Arena to play this game. For windows, linux and macintosh.
Aleph One is the open source continuation of Bungie’s Marathon 2 game engine. Available for Mac OS X, Windows, and Linux, Aleph One supports Marathon 2 and Marathon Infinity natively, and Marathon through a fan-made conversion. Many third party scenarios and net maps are also available.
