PC (Microsoft Windows)May 21, 1999
Released ✓ 
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C-evo
C-evo is a free turn-based strategy computer game whose source code is in the public domain by German developer Steffen Gerlach, its programmer and designer, making the game freeware.
4X (explore, expand, exploit, and exterminate)Turn-based strategy (TBS)
Game modes
Single player
Player perspectives
Bird view / Isometric