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Does DOOM count? It's been officially open sourced recently, even though it was already treated as such for decades.Either way, I can't stop playing it, there's 30 years of user created content to go through.
Id Tech 1 (Doom) source has been available since 1997 under a restrictive license and under the GPL since 1999, so not "recently". But yeah, that's my answer. Original Doom.
That's what I'd go with it. Came here to comment it, but I was beaten to it. There are so many great ways to play through it, as the modding community has made so much amazing stuff over the years.
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