An open source re-implementation of RollerCoaster Tycoon 2
- OpenTTD
- Net hack
- Boom/Doom
- Quake/Quake 2
The ones that come to mind are Beyond All Reason and Battle For Wesnoth.
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.
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.
it's not really a game, but openmw
Xonotic
Cataclysm: Dark Days Ahead Battle for Wesnoth OpenTTD Doom
Mindustry, Endless Sky, and Unciv.
FreeCiv is a classic and still fun. rogue and nethack are good, too.
$10 on Steam, free everywhere else
Super Tux kart I think it's underrated and fun
- 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
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.
DCSS, Minetest and Simon Tatham's Puzzles.
supertuxkart, mindustry, unciv and xonotic are my favorites so far
Xonotic.
Formerly known as Nexuiz, until the lead dev sold the naming rights.
Veloren!
Osu. Please save me.
Velorem and Endless Sky!
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
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.
KeeperFX - an opensource decompilation project and fan expansion of Dungeon Keeper.
VCMI - it's re-written from scratch, open source, multiplatform Heroes 3 engine with many improvements and mods manager. It requires some files from the original game though.
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.
- Super Tux (i played this since i'm three)
- osu!lazer (rythm game)
- shattered pixel dungeon
0ad, warmux
I didn't see anyone mention Warzone2100 yet. An excellent RTS, with a neat research system and unit customisation, and fun campaign. They've recently added a couple of new campaigns I haven't played yet, and have enough ongoing dev work on skirmish/multiplayer that some AIs are listed as "X% win rate in AI matches".
QuakeWorld and old school Doom for FPS, Beyond All Reason for RTS, Dungeon Crawl: Stone Soup for roguelikes, Hedgewars for a Worms-like.
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.
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
OpenTyrian
CDDA
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
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
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.
minetest is a rather neat game engine, good bit of gameplay there, even more with the mods and other games you can play.
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...
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.
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.
Minetest and Widelands
Permanently Deleted
