since no one's mentioned them:
- Oolite
- Dungeon Crawl Stone Soup
this post was submitted on 23 Jun 2026
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I'm not very good at it, but NetHack catches me every now and then.
Space Station 14 for me.
Battle for Wesnoth. It's a fantasy-themed turn-based strategy.
Though I haven't played it recently, I have some very good memories. It teaches you gambling and probability (especially on small multiplayer maps), and you develop feeling for the difference between 40% chance to hit and 30%.
The single-player campaigns are nice too. The one that I have in especially good memory is "Under The Burning Suns", which made a few creative and artistic changes to the game. It shouldn't be the first campaign you play, but it can be the second.
I still think about garak and under the burning suns from time to time. The plot is decent and while there's not much writing, what's there is generally good. I'd rate it better than the vast majority of games, but general consensus would probably place it below planescape torment and disco elysium. I really liked it.
Recently, battle for wesnoth has remade the delfador campaign and heir to the throne and tried to unify a bunch of the mainline campaigns together. Deceiver's gambit and the new httt are imo respectively second and third best wesnoth campaigns now.
I still think about garak and under the burning suns from time to time. The plot is decent and while there's not much writing, what's there is generally good. I'd rate it better than the vast majority of games, but general consensus would probably place it below planescape torment and disco elysium. I really liked it.
Recently, battle for wesnoth has remade the delfador campaign and heir to the throne and tried to unify a bunch of the mainline campaigns together. Deceiver's gambit and the new httt are imo respectively second and third best wesnoth campaigns now.
Beyond All Reason or Xonotic.
Xonotic is so fast and smooth.
Dwarf Fortress
I also really like Nightmare Kart which is free on steam, but I don't think it is open souce...?
DF isn't open source tho. It's not even source available.
People have already said a couple of my favorites ( Super Tux Kart and Mindustry ), but I'd like to bring up one almost nobody talks about: Me And My Shadow
It's a 2D puzzle platformer where you control one person normally but then press space to record movement for your shadow character. Last time I tried downloading and playing it on Linux using the appimage on Sourceforge, pretty sure it didn't work because it might need an old glibc that has features that might not exist in newer versions.
This post reminded me of the game, so I'll download and see if I can run it on my desktop. Really feel like playing it now.
Edit:
I am too dumb to figure out how to make it work. Best I get is nothing. Not even a pop-up saying I need something else to make it work. So, I guess plating the windows release through WINE is the best I'd be able to do.
I played hundreds and hundreds of hours of Tremulous back in the day, and at least a few of its successor Unvanquished -- before mostly falling out of playing online games.
Adding OpenRCT2, but I think most anyone who knows of OpenTTD knows of that.
Also, I'm not sure you can count OpenRCT2 as fully open source, as it still requires the closed-source game files to run -- they haven't replaced all the game assets yet.
(That said, it's still fantastic and by far the best way to play RollerCoaster Tycoon.)
Friday Night Funkin!
I still play 0AD every now and then
Not sure if it's my favorite, but openttd was already mentioned.
It's such a fun game, especially after you beat a campaign level. I love that part purely for the freedom it provides after a hard fought battle.
Super Tux Kart
beyond all reason
Endless Sky if you’re down for a top-down space shooter mining grind.
Or a trading grind, depending on your playstyle. I've barely ever mined in it.
How are they doing on the campaign/storyline, BTW? Last time I played it (a year or so ago) I managed to capture a jump drive and explored a bunch of really interesting areas outside human space, but it really felt like I wasn't intended to be there yet and the story wasn't really ready for it.
SuperTux! 🐧
Isn't Doom open source now? Does that count?
It is and it does.
However it is unclear where Diablo stands. We have open source decompilations and remakes but as for the legality: grey area.
Unciv
Tux Kart
Katawa Shoujo: Re-Engineered
These 3 games are my favourites at the moment.
VintageStory is kinda open source, and far more polished than any other minecraft clone.
Which part of it is open source?
The core mods are source available, and the base game is open source iirc
Didn't know they actually published some source code. I looked at their GitHub account, unfortunately almost all of their repositories have this in their readme:
This is proprietary software owned by Anego Studios. All rights reserved.
You may NOT sell this software in any way, shape or form. You may NOT distribute this software in its unmodified form.
That's not gonna stop me mwahahahaha
Pixel dungeon.