These are the FLOSS games that stand out, list your own favourites or most-play games.
--//--
I would rate all of these, as worth a try:
Shattered Pixel Dungeon
Cube2:Sauerbraten
SGT-Puzzles
Andor's Trail
AssaultCube
Minetest
Neverball/Neverputt
PowderToy
0ad
Fillets-ng
Anuto TD
Xmoto/Bloboats
Flightgear
Kobo Deluxe
Enigma (oxyd)
LiquidWar5
H-Craft Championship
Numpty Physics
Wesnoth
The Dark mod
Have completed SuperTuxKart, BlobWars 1&2, Flare, Frozen Bubble, Hex-a-Hop, Holotz's Castle, SearchAndRescue II, Alex the Alligator, Project:Starfighter, Stormbaan Coureur, Trigger, all are fun.
--==--
Can find details about most of the above games here:
https://libregamewiki.org/List_of_games
FLOSS gaming is excellent, thanks to all these devs and asset creators.
--++--
BONUS TOMT:
I'm looking for the name of a FLOSS Quake1-mod, puzzle game, that was about placing gravity points, to curve a stream of particles around the level, and eventually into the goal target. (May have used irrlicht)
If anyone knows the name of this one, please let me know, it is my white-whale of games.
I tried CDDA, need to try it a bunch more to figure out what is going on.
Endless Sky really did seem endless in terms of time needed to play. I didn't get into the real depth of exploring different systems.
Did autocomplete change Hedgewars -> Hedgehogs ? Or do you have a link for Hedgehogs?
The closest to CS2 is Urban Terror (UrT), but it has proprietary bits in it, and feels dirty after a while.
Wolfenstein:Enemy Territory is pretty good for round-based team play. Not sure how active these days.
I think Assault Cube Reloaded tried to hit the COD style of play.
IMO CDDA reinvents what complexity means. I found it both interesting and frustrating at first. Modding is actually quite approachable and pretty much entirely in JSON files. Once you get an idea of the basic layout, just get used to going in and changing what you really don't like about the game.
I really like the Sky Island mod right now, and have been playing with it for weeks. I don't go in to mod items in the game like some kind of cheat code or when I find it frustrating to find or do X/Y/Z. The game (experimental build) is full of little odds and ends. Like I'll occasionally find things where I can disassemble a thing but can't assemble it using the same tools or someone made a complex version of an item that is needlessly advanced for the purpose so I go in and make a simple version. At first I was concerned about making pull requests or sharing my stuff, but I think that is quite premature for me. Maybe if I make some stuff that is super useful or interesting I will share that item. It has really been an eye opening experience to take open source responsibility for my own frustrations in the game. My frustrations have become my own challenges. Maybe it is my age but I spend about half my time modding and half playing. There are warnings in the game and documentation about how what I am doing can ruin the game experience. However, I have found the actual gameplay documentation is too terse for me, especially given the game's complexity. Between the better dev documentation, and reading the JSON and CPP, I find it fun to play around. For me on Linux, they haven't been adding the nightly builds for Linux to the precompliled binaries, so that got me into using the make file already. I'm still figuring out git branches and merging with minimal success, and making my own mod file that can replace items defined elsewhere eludes me, but I'm working through it. I only have a little more than a dozen items I've actually made and about that many alterations.
...
Yeah, hedgewars is what I meant.
Thanks for the references. I'll check them out sometime soon.