This list is a little old, so some of the links may not work anymore, but overall it's still a pretty solid compendium for any budget concious Linux (or Windows) gamer!
Know of a game that should be added to the list? Leave a comment below! ^_^
Sick of hats, nerfs, and other changes to TF2? Than Classic is for you! TF2 Classic is a resurrection of what the game was like in 2013, with restored gamemodes, guns, and classes
RTS set during the Bronze Age in the Ancient Near East. Manage a delicate balance between food surplus and the maintenance of your army - Multiplayer mode available
Turn-based 4X/RTS Strategy space colonization game - This is a commercial game that was open-sourced, you must compile the game from source code to obtain it for free. Consider buying it on Steam or GOG to support the devs
Inspired by Civilization, SimCity and Dwarf Fortress, Arcane Fortune is a game of empire building, diplomacy, conquest, construction, and deconstruction. Whether or not you build a utopia, or a hell on earth is entirely up to you
Famous RL that has both a City-builder/management sim mode, as well as a more traditional RL experience in adventurer mode (you can even visit the ruins of fortresses you've built in the sim mode)
Uniquely free to Linux users only. A tense roguelike that mixes stealth and arcade action. Explore the smouldering ruins of apocalyptic Basingstoke, UK, a world of extreme peril where reanimated undead and ferocious alien monsters roam!
a classic overhead run-and-gun from the DOS era updated for modern systems, supports up to 4 players in co-op and deathmatch modes - Installer Downloads
Minecraft clone written in C++ instead of Java for better performance. Base game is purposefully lacking in features, instead relying on mods from the community to flesh out the experience
Good list. Covering many different categories. Have found every game I thought of. I like that the roguelikes listed are the actual, "classic" roguelikes.
What I don't like: inclusion of the games that cost money to play (via in-game purchases). These should be at least marked as such, pretending they are free is not OK.
Back when I created this list, I had the mindset that if I did include a game with the a Free to Play monetary model, it would only be eligible if it was absolutely not Pay to Win, and if it was possible to have a lot of fun without and be on a fully equal playing field spending a dime.
Looking over the list again, I think you're right in that a couple titles (runescape, eledivin, and argueably EVE online) really don't meet that criteria.
However, I think others such as CS:GO, TF2, and War Thunder still deserve a spot on the list, as you're still experiencing the full game with no disadvantage without spending anything.
But I will remove those titles and put Free To Play in the description of the others.
Though I mention the monetary aspect, it doesn't mean I'm not fully aware of and advocate for the FOSS philosophy. I would've thought going to the extra effort of finding out what software license each and every title used, along with a direct link to the source code (which in some cases was not trivial to find) would've made that much obvious.
Hoping I'll find a good fps in this. Been looking for one for a while now. Most of them are basically fancy doom wads and quake clones. Might be able to find something of a more modern style.
A few personal recommendations here: Xonotic is the most engrossing quake clone I've ever played. The gameplay is fabulous and it would run on a potato. Definitely check it out if you like arena shooters.
Also people who bounced off FreeCiv for its somewhat dated mechanics (I believe it's most similar to Civ 2 in terms of gameplay), might enjoy Unciv. It's a FOSS porr of Civilization 5 and the last time I played it a few years back it appeared to be almost feature complete in terms of parity with its inspiration.
Lastly nethack is hard as nails and I've never been able to finish it. Good game though!
Dang, I remember playing that when I was 14 or so. Surprised to see it's still being developed. Looking at gameplay of the latest release... It still looks awfully janky still. Does it play well nowadays?
Been a long time since I played it myself, but it was my first introduction to space sims.
Development of the game picked up again just a year or so ago, after a long time of hiatus.
Yeah, the game looked nice over 15 years ago, but the graphics haven't updated at all, so the visuals are incredibly dated. Gameplay is still quite solid, though, and the background simulation aspect of the game is still on-par with Elite Dangerous, so I'd say it's a pretty good choice if someone is looking for a FOSS space sim.