Open Source Video Games have come a long way in the last few years. This series of articles looks at the current state of games in the Free or Open Source World.Part 1 focuses on Adaptations and Modifications of Id's GPL'd Quake Engines.
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With looks at Tremulous, Warsow, Nexuiz, and 5 more of the Best Open Source Quakers, it's easy to see the strong base idtech provides the community.
Part 2: Real Time Strategy