I'm usually a fan of open source games but rarely do they manage to be actually great. People like giving recommendations like Super Tux Kart that haven't aged well and don't play well. What are some open source games that are legitimately good that I've missed?
My favorites are:
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Mindustry
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Sonic Robo Blast 2 Kart
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Powder Toy
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GZDoom (and all the amazing mods for it)
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Veloren (even though it's still in alpha)
Does open source implementation of proprietary game counts? OpenMW
We only reimplemented the engine, not the game. You still need to own a copy of Morrowind so there's something for the new engine to actually run. That said, it is possible for it to run other potentially-open-source games, such as OpenMW's example suite (which isn't finished enough to even call a game yet) or the Robowind demo (which I can't remember the licencing details of) .
I have wasted almost as many hours in OpenMW as I have with the official engine. It is just that good.