OpenSourceGames.net - A simple list of 100% mandatory Open Source Games.
Free and open-source software is good for you and good for the world. These are the best free games that we know of.

Shooters

Cube 2

Cube 2: Sauerbraten

A single-player or multiplayer shooter that's free and open source. Mac.
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Freedoom

Freedoom

A version of the classic first-person shooter Doom that's free and open source. Mac.
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Strategy

freeciv

Freeciv.net

A multiplayer strategy game that's free and open source. Mac.
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glest

Glest

Magic and Tech battle in this real-time strategy game that's free and open source. Mac.
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The Battle for Wesnoth

The Battle for Wesnoth

A turn-based strategy wargame of humans, elves, dwarves, orcs, and trolls that's free and open source. Mac.
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MMORPG

planeshift

PlaneShift

Adventure through a giant stalactite in this massively multiplayer online role-playing game that's free and open source. Mac.
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Various

neverball

Neverball

A 3-D ball game that's free and open-source. Mac.
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Scorched3D

Scorched 3D

A turn-based artillery game that's free and open source. Mac.
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Lugaru

Lugaru

You're a rabbit seeking vengeance agains the wolves in this free and open source action game. Mac.
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