For me it's CDDA, a quite realistic and deep apocalyptic survival game with very frequent updates(on the experimental branch)
Gaming
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Thanks for the Veloren recommendation, I liked Cube World, it just didn't work out well.
Battle for Wesnoth is a personal favorite of mine that I haven't seen mentioned elsewhere in the thread. It's a pixel art, hex-grid turn based strategy game with fantasy armies. It's mixed with mild RPG elements, and there's tons and tons of campaigns and fanmade content accessible directly through a mod browser in game.
The other games I enjoy that I see being mentioned here are in the same vein. BAR, Warzone 2100, OpenTTD. And the open mods based on the STALKER engine, like Anomaly. I love those.
Dungeon Crawl Stone Soup for me. A classic roguelike with active community and regular updates as well as several forks. It also has a good amount of playable races. From classics like elfs or orcs ~~and dwarves~~ (RIP Mountain Dwarves you were too good for this game) to funky races like Vine Stalkers (sentient parasitic plants) and Armataurs (centaurs but with armadillo parts instead the horse ones) to cats and octopuses.
And the gods you can worship in the game are also very diverse. How about a slime god? Or someone who wants you to wear as much cursed equipment as possible in exchange for knowledge? Or maybe the one who wants everything to move veeery slooow and rewards you for killing mobs that are faster than you?
One of my absolute favorite games as a kid was Glest. Turns out it's open source and is now available as MegaGlest!
It takes a lot of inspiration from Warcraft but it has its charm and many of the races are quite unique in how you play them!
Does City of Heroes count? It was closed source but was opened...
Technically not the whole game, but Smash Remix is an open source rom hack of the original Super Smash Bros. for the Nintendo 64. It's been a blast from the past and I'm enjoying the hell out of it.
I also love the fact that a lot of N64 emulators are open source too, like Mupen64 or simple64
I've had a ton of fun in Red Eclipse over the years.
Tremulous - The game was so fun back then (like 10 years ago ?) I guess it's a dead game now.
classicube is pretty cool, open source Minecraft classic-like game (so, no crafting or survival aspects, limited world sizes)