Best free (as in freedom) video games

Many of the games that say no under the *BSD categories, can probably be made to work or already work by just compiling it/changing a few things. You can also check here for information on OpenBSD ports. I will try to compile some of the games on other platforms an see if they work.

If you know of a game worthy of being here, please email me at ysu@yysu.xyz.

Game License Linux FreeBSD OpenBSD MacOS Winblows
SuperTuxKart GPL v3 yes no no yes yes
Xonotic GPL v2 yes no no yes yes
NetHack GPL yes yes yes yes yes
OpenTTD GPL v2 yes no no yes yes
Cube zlib yes no no yes yes
Flare GPL v3 yes yes no yes yes
FreeCol GPL v2 yes no no yes yes
FreeOrion GPL v2 yes no no yes yes
Lugaru GPL v2 yes no no yes yes
Mindustry GPL v3 yes no no yes yes
Vega Strike GPL v3 yes no no yes yes
OpenDungeons GPL v3 yes no no no yes
SRB2 GPL v2 yes no no yes yes
Unkown Horizons GPL v2 yes no no no yes
Unvanquished GPL v3 yes no no yes yes
Vega Strike GPL v3 yes no no yes yes
0 A.D. GPL v2 yes no no yes yes
The Battle for Wesnoth GPL v2 yes no no yes yes
FlightGear GPL v2 yes yes no yes yes
FreeCiv GPL v2 yes yes maybe maybe yes
HedgeWars GPL v2 yes yes no yes yes
Minetest LGPL v2.1 yes yes yes yes yes
Oolite GPL v2 yes no no yes yes
OpenArena GPL v2 yes no no yes yes
Pioneer GPL v3 yes no no no yes
Stunt Rally GPL v3 yes no no no yes
Teeworlds custom yes no no yes yes
Torcs GPL yes yes probably no yes
BetterSpades GPL v3 yes maybe maybe no yes
C-Dogs SDL GPL v2 yes no no yes yes
Pingus GPL v3 yes no no yes yes
Terasology Apache v2.0 yes no no yes yes
Endless Sky GPL v3 yes no no yes yes
Warzone 2100 GPL v2 yes no no yes yes
Widelands GPL v2 yes no no yes yes
Veloren GPL v3 yes no no yes yes
Widelands GPL v2 yes no no yes yes
ET: Legacy GPL v3 yes no no yes yes
Spring:1944 GPL yes no no no yes