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.
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Let's just get it out of the way from the get-go: this is an open-source Civilization II-like. It's pretty good, although I never got hooked by it as much as what it's imitating - not out of it being worse, but rather that it was just different enough from Civ to throw me off at a time when I was still trying to learn Civ itself. Someday I might revisit this game and the various mods and additions that were made for it.