The Dark Mod is an awesome tribute to the Thief series, but often goes unmentioned in threads like this for some reason. Arguably, it's even better than Thief at this point, and has new content added on a regular basis by it's community.
It used to be (I believe) a Quake mod back in the old times, hence the name, but it's long since been transitioned to a standalone game with a different engine.
i am tired boss
check Unnamed FOSS Game Thing for niche games
Simon Tatham's Puzzles. 40 different puzzle games. It's in the Debian repository and it's on F-droid. The package in Debian is called sgt-puzzles.
"The Ur-Quan Masters" is literally Star Control II, one of those classic games people rave about, and it's FOSS now.
A lot of the best games are open source engine rewrites of things that need some old game's data files, like Doom (currently UZDoom), Roller Coaster Tycoon (OpenRCT2), and Master Of Orion (1oom).
A lot of the other best games are roguelikes. There's so many fucking open source roguelikes. Brogue and Dungeon Crawl: Stone Soup are good starting points.
Gotta shout out The Battle for Wesnoth on the turn-based strategy end of things. Twenty-three years on and still going strong with a plethora of user-made campaigns and multiplayer.
SRB2Kart with mods is a better Mario Kart
source: https://github.com/STJr/Kart-Public
a silly video: https://www.youtube.com/watch?v=1BgUQB2kjPs
Here are my favourite complete (not beta or prototype) FOSS games.
Traditional roguelike with lovecraftian horror inspiration. It's hella hard but also weirdly relaxing after a few tries, plus the ambiance is exquisite.
Is really fun, has two main game modes: Erekir (Classic, high skill ceiling, less hand holdy) and serpulo (More polished, Easier and more straightforward)
Age of empires, I loved AoE2 and this game scratches that itch too.
Not poster children for modern FLOSS, but two fun oldies
Slash'em is an old NetHack GUI mod, but it is so much fun.
In the same genre, Elona Plus (download link here) is ancient, open source, super weird but extremely content-filled. And continues to be updated to this day. I've probably spent 100 hours on it over the years.
Do people still like Veloren? It's like FOSS Minecraft and then some
Cataclysm: Dark Days Ahead
X-Piratez (openxcom mod about lesbian space pirates, haven't played it but looks like it has very deep lore and complex mechanics)
Warzone 2100 (RTS)
Battle for Wesnoth (TBS)
Mindustry (Factorio-like but more casual)
0 A.D. (RTS similar to Age of Empires)
Beyond All Reason (RTS similar to Total Annihilation/Supreme Commander)
openTTD (transport tycoon)
No Brogue CE in this thread...
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I'm not sure its FOSS, but its available in repositories so there is some degree of it being FOSS.
I really like Endless Sky; its basically a rebuild of Escape Velocity, and I think it's a great game.
It's a 2D space opera, you start out as a small shuttler and work your way up to massive fleets.
I don't remember much about Escape Velocity, but Endless Sky has a pretty decent story as well.
If you're looking for multiplayer with surprisingly deep mechanics and some (a lot of) chaos, check out Space Station 14. I am mostly playing and contributing on Starlight servers but the others are great too!
I never played much of it, but Battle for Wesnoth is very polished and entirely a free culture project - all game assets have free licenses that allow reuse and remixing, not just the code.
There are a surprising number of good open source RTS games due to the spring engine.
https://springrts.com/wiki/Games
Beyond all reason is good fun.
Openrct2 openttd xmage
I used to spend a lot of time on Xonotic (and Nexuiz before that), but I haven't played in forever.
SuperTuxKart is a silly yet fun one
OpenRA is an open source implementation of the CNC engine. Game files need to be found for the campaign though.
Beyond all reason is total annihilation.
DCSS - roguelike, good, extremely deep, online play via ssh or telnet if you like
Brogue
nethack
Angband
mindustry
Teeworlds is a lot of fun
Neverball: 3D physics platformer similar to Super Monkey Ball
XMoto: 2D physics platformer, seems impossible to control at first but somehow it just clicks at some point and then it's great
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