Doom is not fully open-source #81
Description
Doom's source code technically is open source however the actual game data, the .WAD (the maps, music, sprites, textures etc.) is not and it's still non-libre (including the shareware wad). The term "Doom" encompasses the engine + data meaning it's not actually fully open source. Same applies to Quake, Wolfenstein 3D and probably other games.
On a related note, Freedoom is a fully free and open source FPS game made for the Doom engine, so it should get added to the list.