Alien Arena

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Alien Arena is for the most part a classic Arena FPS with some interesting team-play modes. While its retro Sci-Fi style might not be everyones most favorite, gameplay is solid and somewhat inspired by the Unreal Tournament series.
Alien Arena is using the FOSS CRX engine, which is a distant descendant of the GPL idTech2 (Quake2) engine. Artworks are only licensed for freeware use with the game.

red.planetarena.org

Alien Arena: Tactical Trailer