QuakeWorld and old school Doom for FPS, Beyond All Reason for RTS, Dungeon Crawl: Stone Soup for roguelikes, Hedgewars for a Worms-like.
0ad, warmux
CDDA
I don't know if it counts, but I think the source code of Freespace 2 was released eventually und a non-profit license. The community did some great things with it, especially the Blue Planet campaign.
God, I loved this game.
Armagetron Advanced - a Tron light cycles clone that was a blast for a long time. They even released for free on steam. I've not played in a long time, but now want to jump back on
It's definitely a work-in-progress title, but I have really enjoyed SuperTux Advance (AGPL-3.0 according to their github page). It's like SuperTux but with sliding, more playable characters, and more power ups. As of now it's probably my favorite OS game at the moment.
-Ace
Reading SuperTux Advance made me imagine a Game Boy Advance demake of SuperTux, that would actually be so cool.
Edit: Oh, it seems I was half correct. It appears to be a re-imagining of the original game in a GBA art style.
Teeworlds/DDNet. It has a very simple movement mechanic that is difficult but so satisfying to master, and the skill cap on community maps is crazy
Cataclysm: Dark Days Ahead
It's a time machine that teleports you to 3am the next day.
Sanmill
Basically nine man's morris, it's pretty fun trying to beat progressively harder AI. Each difficulty requires a different (better) strategy. It's like unlocking levels in a puzzle game.
Cyberpunk 2077
It's funny because it's true. And it's funny because people think you're trolling.
But you're wrong.
Open source is not the same as source available. I'm not going to do a deep dive on definitions and licensing, but open source generally means that you are allowed to do what you want with it. It also usually implies that if the creator updates it, that updated code will also be shared.
The leaked Cyberpunk 2077 source code is from 2022 at the absolute latest (released 2024 from a hack done in 2022), is not open source licensed for re-use (meaning any use of it by people outside of CDPR is illegal), and they have released numerous patches, updates, and an entire DLC since.
It’s a joke
minetest is a rather neat game engine, good bit of gameplay there, even more with the mods and other games you can play.
CrossCode is really good, but it isn't free. I need to look through my Steam library to see which other games might be open source too. This is the only one I'm aware of, really. ProtonDB might have a list of games that are open source. It's a great resource for checking compatibility if you're playing on Linux.
I'm a simple girl:
Too bad there isn't a single good linux pacman around...
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