An open source re-implementation of RollerCoaster Tycoon 2
The ones that come to mind are Beyond All Reason and Battle For Wesnoth.
- OpenTTD
- Net hack
- Boom/Doom
- Quake/Quake 2
I asked this a while ago which is how I discovered Beyond All Reason which has been my FOSS game of choice as of late.
I'd also recommend Naev and Endless Sky (Both are based on the Escape Velocity Series, Naev is getting a 3D PBR renderer in the next release). Mindustry is good fun, actually purchased this one on steam to support the amazing developer. Extreme Tux Racer is a bit of fun and Super Tux Kart seems to get better with every update (did I mention it can run on the Nintendo Switch via homebrew!)
Edit: I forgot about 0ad and Minetest which I used to play a bit of a while back
Simon Tatham's Portable Puzzle Collection
It's available on Linux, Windows, Android, iOS, and the web.
I play them on my phone to pass time.
Space Station 13.
Too many amazing moments and memories to even count, always more to learn. I love how the open source nature of the game means there's many different servers branching off from each other, running their own custom versions of the game. Smaller servers "downstream" pick and choose which features they want to keep when the upstream servers implement something new.
it's not really a game, but openmw
Cataclysm: Dark Days Ahead Battle for Wesnoth OpenTTD Doom
Xonotic
Mindustry, Endless Sky, and Unciv.
Mindustry, SuperTuxKart and Thrive probably
Haven't played it much but for all fans of Thief games there's foss game called The Dark Mod. And I haven't seen it mentioned here, which is a shame.
$10 on Steam, free everywhere else
FreeCiv is a classic and still fun. rogue and nethack are good, too.
- Endless Sky -- open-source space game. I actually contributed to it back in the day; a date format option and a full-blown storyline about an author. Unfortunately the storyline is in development hell cause I lost motivation to work on it.
- OpenTTD -- really awesome, with NewGRFs and mods you can have a somewhat "realistic" rail experience (as in, using actual real-life trains. Obviously a pixel game isn't the most "realistic" with graphics)
- Mindustry
- Pioneer Space Sim
Super Tux kart I think it's underrated and fun
Widelands is a great strategy / building game. The gameplay and UI style is a niche - but that's one of the things I like about it. It's doing something different to most games.
(The gameplay is similar to Settlers 2; before that franchise changed direction.)
[edit] But the open-source game I've spent the most time playing would be OpenXcom-extended, with xpiratez. That game is truly huge.
supertuxkart, mindustry, unciv and xonotic are my favorites so far
DCSS, Minetest and Simon Tatham's Puzzles.
Xonotic (quake-esque FPS, IMO its like quake and halo had a FOSS child), Minetest (a voxel game engine, multiple games are available for it), and Mindustry (sandbox tower defense) are the only ones ive tried so far
Velorem and Endless Sky!
Osu. Please save me.
- Super Tux (i played this since i'm three)
- osu!lazer (rythm game)
- shattered pixel dungeon
KeeperFX - an opensource decompilation project and fan expansion of Dungeon Keeper.
QuakeWorld and old school Doom for FPS, Beyond All Reason for RTS, Dungeon Crawl: Stone Soup for roguelikes, Hedgewars for a Worms-like.
Super Tux Kart (I play it on Android) is NOT one of them. The physics system is bad at some moments, the items aren't fun to use and some of them ruin the game. The overall game feels amateurish (in a bad way), but one thing that I like is the Windows Car and the drifting. Those are awesome.
it's gotta be Xonotic baby, basically a quake clone that is completely free, a decent sized player based and frag loads of fun!
Got it on me Ubuntu desktop starting out for FOSS games.
0ad, warmux
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
CDDA
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
minetest is a rather neat game engine, good bit of gameplay there, even more with the mods and other games you can play.
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.
Gauguin - Sudoku-like game for Android (on F-Droid)
The instructions are not clear at first so it's better to start the game a new with lower difficulty.
Quake
I still play Elona and several flavors of Angband.
Greatly improved by community contributions.
I'm a simple girl:
- LTris
- LBreakoutHD
- Gweled
- Frozen Bubble
- Gnome Mahjongg
- Gnome Tetravex
Too bad there isn't a single good linux pacman around...
OpenTyrian
Minetest and Widelands
From fdroid, Feudal Tactics and Antimine.
Apotris is an excellent famous-block-stacking-game clone for the GBA (and other platforms), it has a version for Portmaster that will run on many if not all Linux handhelds like the RG35XX and similar, but will also run in any GBA emulator.
Open Hexagon
Andor's Trail - RPG where you search for your missing brother. Still under development, but there's a lot of content. It's convenient to fill a few spare minutes or waste hours.
Technically Urban Terror isn't open source, but the Quake3 engine it runs on is.
