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, etc
Used to enjoy Red Eclipse1.6, before it was retired.
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.
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.
I’d also recommend BZFlag, Xonotic, OpenClonk, and OpenLieroX. A surprising number of people are still playing BZFlag. Xonotic has some of the most fun weapon mechanics I’ve seen in an arena shooter and pretty much all of them can be used for movement shenanigans in different ways. OpenLieroX has a wealth of fun mods to mess around with.
Would you count GZDoom and games that use its engine? Due to its license, devs of even commercial games made with it have to publish source code if they modify the engine and the very nature of the iwad files it uses means that all of iwad’s game code (I guess except compiled ACS scripts, which people don’t use as much anymore) is in plain text.
Also I kinda still enjoy Red Eclipse 2.0 even if I found the balance and gameplay of 1.6 better and you can kinda mess around with the weapon variables until it does feel the same. Used to enjoy doing that a lot with 1.6, even doing stuff like turning the shotgun into a chaingun.
