Does City of Heroes count? It was closed source but was opened...
Gaming
From video gaming to card games and stuff in between, if it's gaming you can probably discuss it here!
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For me it's CDDA, a quite realistic and deep apocalyptic survival game with very frequent updates(on the experimental branch)
The only one Ive played for any length of time is freeciv, which as the name implies is based of the civilization games, mostly civ2. It's a bit old looking these days and setting up multiplayer has always been a bit fiddly, but the gameplay is pretty fun imo.