I’m looking for recommendations on high quality open source games to try. Some of my favorite games I’ve played recently are Factorio, Kerbal Space Program, and Outer Wilds, but I’m willing to try many kinds of games (besides FPS).
Yeah I saw a recent post about that one and am trying it out. It seems pretty good so far, and that’s what got me to ask this (most open source games I’ve tried have felt really unpolished, whereas with other software I primary use open source). But because the creative aspect of games I’m perfectly fine with using closed source games (they aren’t really as fungible as other software).
Each of these are quite polished (especially for open source games!), widely packaged, not too complicated to start playing (except perhaps FlightGear) and have been around for a long time. Endless Sky, FlightGear and OpenTTD have quite active development, while Torcs is much quieter nowadays (although there is an actively developed fork called Speed Dreams which is awesome, just not widely packaged yet).
I've been meaning to try out FreeOrion and Minetest for a while now, looking forward to seeing what else pops up on the thread!
I just wish Endless Sky would migrate some folks over from Reddit to the Fediverse. The Discord is ok, but there is a certain amount of unnecessary toxicity that's seeped into the development. I kinda feel like having another place to talk about development outside the Discord might help.
Excluding the two games that were already mentioned, personally I find Zero-K and FreeOrion to be pretty high quality open source games and enjoyed both of them. The first requires steam afaik so there's quite a limitation and the latter is still far from complete, but it was still enjoyable with a lot of interesting game mechanics when I played it.
Some other FOSS games that I consider high quality but haven't played quite as much so can't say for sure, or don't have strong opinions about:
0AD, OpenRA, OpenTTD, OpenRCT2. Simutrans, Unciv, CorsixTH, UFO:AI, Bitburner
Some other FOSS games that I've read about a lot and as far as I know are really popular and considered relatively high quality, but I either haven't tried them at all or find them (a bit) overrated:
Beyond All Reason, Freeciv, Unitystation / Space Station 14, Hypersomnia, Veloren
You wrote that you're not looking for FPS games. Note that Hypersomnia is a top-down shooter and Veloren is a third person (over shoulder) action RPG. So if you dislike shooters or if you dislike specific camera locations these might not be for you.
Games that are also sold on app stores, steam etc:
shattered pixel dungeon
mindustry
keeperrl (only ascii version is free and I don’t know how playable it is in that state)
Games that are around for quite some time or gained quite a community around it at some point:
The Battle of Wesnoth
Cataclysm: Dark Days Ahead
BrogueCE (animated ascii graphics)
Minetest
Super TuxKart
Super Tux
Hedgewars
Open sourced commercial games:
Castle Doctrine
Warzone 2100
Soldat
Astromenace
Though for those who are more engines (SpringRTS and minetest) the quality really depends on the mods you are playing.
Some stuff I just found and never played myself:
Catburglar
Roboden
Open sourced commercial games:
Charge Kid
duelyst
Super Lemonade Factory
OpenClonk
Seven Kingdoms
Assets are unfree but freely accessible:
Cendric2 (nc-nd)
Star Ruler (nc without music)
Cart Life (freeware)
Postal (freeware)
Pocket Island (nc-sa)
Strange Adventures in Infinite Space (nc)
I’m not sure about whether these games got 100% FLOSSed or still require bought assets:
BYTEPATH
A special case because these use CC BY-NC-SA even for source code, which is effectively unfree. They are ports of older Mac games, but most are 3D:
Mighty Mike
Cro-Mag Rally
Bugdom 1
Bugdom 2
Billy Frontier
Nanosaur 1
Nanosaur 2
Otto Matic
The “problem” with the open source game landscape is, that a lot of games are either focused on multiplayer or have randomly generated worlds, because that developers can play that too. There are games with single player story line, I think open sourced commercial games are doing a bit better with this. Commercial open source games that are open source from the beginning are a newer development.
If you don't mind severe time investment, Tales of Maj Eyal. It has a paid version on steam for people who want to support the devs, or a donation option on their site, but it's also open source.
I just mean games that feel a little more polished and less like a toy project; games that have a stable release separate from development would be one example of a more mature polished project.