Did you guys tried Endless sky? Awesome game if you love space
And minetest+mineclone2 is pretty good if you want to play minecraft but don't have the license
Shattered Pixel Dungeon ! And its origin, Pixel Dungeon.
A really nice rogue-like, among the best Android games I know, it’s still fun after all those years and very actively developed !
Great classical roguelike
Beyond All Reason is AMAZING. I can't say enough about it. Its my favourite game, and totally annihilates (!) the competition.
Though I guess the competition is pretty small for large scale RTS. Maybe:
BAR has fixed all the UI/UX problem, scales well, has a big community, is free, fun, and super deep and complex.
Mindustry is a really fun automation/tower defense game
Second Mindustry, I played it up once and it was great. Basically Factorio for phones.
Mindustry is an awesome strategy game that combines Factorio with tower defense.
Sonic Robo Blast 2 Kart (ridiculous name I know) is one of the most underrated games ever. It's a super polished, high quality Kart game with an insane amount of mods and maps. The online isn't that populated but the singleplayer time trial is TONS of fun. If you like hunting for medals, it can be a pretty deep rabbit hole. There's a sequel in development but no release date.
GzDoom is the most popular Doom source port and there's a practically infinite amount of user generated content. If you don't know where to start I highly recommend Doom: The Golden Souls Remastered and Castlevania: Simon's Destiny. They're good enough to be premium games.
Cataclysm DDA Is THE open world zombie survival experience. So long as you like obtuse roguelikes with nearly no graphics.
Although Im obviously biased what with being a dev and all.
Beyond All Reason
https://www.beyondallreason.info/
It a grand scale RTS game with robots and insects loosely inspired by Total Annihilation.
If you like RTS games similar to Total Annihilation, you should definitely check out Beyond All Reason, it's gorgeous and fun: https://www.beyondallreason.info/
Another supcom similar is zero-k. Didn't know there were so many open source options! Available on steam or at https://zero-k.info/
Veloren is inspired by games such as Cube World, Legend of Zelda: Breath of the Wild, Dwarf Fortress and Minecraft.
You can play single player or multi-player, standalone or use an online server, or even host your own server in a Docker container, or on a Raspberry Pi. Plenty of options!
You start by creating your character, you can collect items for your inventory, you can craft items, there are weapons and combat, you develop skills, can tame creatures, you can trade with merchants, you can socialise, and lost more. There is no single, specific goal or focus, and the idea is to keep exploring and have adventures.
The game is community driven and actually updates quite regularly.
It is clearly no clone of Minecraft. It is fun and adventure!
Cataclysm Dark Days Ahead has been mentioned so I'll add OpenMW to the thread. It's a open source engine rewrite of Morrowind and requires the base game to run Morrowind but it has the potential to be used to create new games and the devs are looking to expand it to allow the creation of ARPGs as well.
Another worthy mention is Endless Sky, it's an open source game inspired by the classic space trading and combat game Escape Velocity.
Have not seen anyone mention one of the best rogue like games out there, Tales of Maj'Eyal
Base game is free to download and play from their website. Massive world, tons of loot, an incredible number of classes and abilities to combine, it's such a fantastic game that also has native Linux support.
https://github.com/open-duelyst/duelyst
Duelyst was a very popular online card game that shutdown around 3 years ago. The developers have recently released it into the public domain (via CC0 license).
You can completely selfhost a private instance (repo has a good straight forward guide)
There is a public instance available to try https://duelyst.org/. Though it might be pretty barren.
There is also a closed fork which should have a more active userbase https://duelyst2.com/, the game rules are a little different (draw 2 vs draw1), but should have more users to get a feeling for the game.
The game in a nutshell is basically Hearthstone on a chessboard. It’s very fun and approachable and in my opinion one of the best cardgames right next to MagicTCG :). Hopefully the community for it will grow more and we can have a sort of second renaissance for it :)
I seriously think that every online only game should have to make the server assets public if they've abandoned it longer than 10 years. So many good games are just lost to time.
Cube 2 Sauerbraten is pretty good! Free arena shooter with built-in level editor
Several, but my number one fav so far is Battle for Wesnoth. An old school hex tile turn based strategy game. Like something out of the 90's or very early 2000's.
Great art, awesome music, solid gameplay, and runs on a potato.
My best friend and I play it whenever we want a casual chill, play n' chat gaming session.
It runs great on the Steam Deck too with a few interface tweaks.
Here's a good start.
Fillets-ng (sokoban puzzler)
Simon Tatham’s Portable Puzzle Collection (sgt-puzzles)
Sauerbraten (FPS)
0 A.D. (RTS)
Holotz Castle (platformer)
Xmoto (motorbike trials riding)
Kobodeluxe (shmup)
Neverputt (minigolf)
Some great games already on here, but wanted to share some love for VVVVVV which released its source a few years ago.
Tux Racer. Hands down.
Oof, I have a huge boner for roguelikes, and most of them are open source. My biggest time sink is still Dungeon Crawl Stone Soup, playable online at https://crawl.develz.org/
Battle of Wesnoth. Haven't played it in a while, but I remember spending hours playing that at one point.
OpenRA has open source slightly modernized versions of Red Alert, Tiberian Dawn and Dune 2000. There's also Tiberian Sun-like and Red Alert 2 mods for it :)
CataclysmDDA is an amazing open source roguelike. Has a bunch of tilesets if you don't like ASCII
Teeworlds. There are some great community made modes for it like FNG and DDrace. Be sure to download it from ddnet.tw to access to extra features created by the community.
There's not a whole lot of activity around it these days, but Zelda Classic is an engine for Zelda 1 with a number of additions and improvements, that allows for custom maps, tilesets, scripts, items, enemies, etc. etc.
I've whiled away an unreasonable amount of time on quests that are on par mechanically and quality-wise with Link's Awakening and the Oracle games. Shame I can't get the tarball to work properly on Steam Deck, it's a great fit for that hardware.
Xonotic is a fun quake-like shooter. Highly recommend.
0 A.D. is the closest experience to Empire Earth I've had on the FOSS side. Great fun!
I really enjoy Thrive, it's basically a modern and more scientifically accurate Spore!
I haven't seen any incremental games get posted. They aren't exactly traditional games, but so many of them are open source like Antimatter Dimensions or Synergism. Bitburner is a unique one as an incremental hacking sim, since it relies on actual scripting to grow and automate tasks.
Classic roguelikes have the most longetivity for me. Crawl, Brogue, Nethack.
Pixel Dungeon! Great rogue like mobile game
Doom :)
If reverse-engineered Nintendo games count, then Super Mario 64 and Pokemon Emerald whose engine is technically open source.
EDIT: Minecraft Beta 1.7.3 has been reverse engineered multiple times too.
Oh I am saving this post! It's a goldmine
Warzone 2100 is an RTS from 1999 that went open source at some point and can be played on just about anything. It's unit design functionality is really cool and I'm a sucker for post-apocalyptic worlds.
OpenRCT2, eDuke32, the various Doom and Quake games
Also ScummVM is open source and supports many games
Shapez is a fairly relaxing factory game. Pretty minimalistic style but easy to lose tons of time to if you aren't careful.
Simutrans. It's old but really good. It's really easy to lose 10h or so in it before you notice the time.
Cataclysm: Dark Days Ahead
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