The VMFs (map source files) and FGD for The Apocalypse's maps. Feel free to use in any way you please.
You may use the source files in any way you please.
To edit and compile the maps, you will need to add The Apocalypse to your gameconfig.txt. Instructions on doing this can be found here:
Developer.valvesoftware.com
Here is an example entry:
"The Apocalypse"
{
"GameDir" "C:\Program Files (x86)\Steam\steamapps\sourcemods\theapocalypseofeden"
"Hammer"
{
"GameData0" "C:\Program Files (x86)\Steam\steamapps\sourcemods\theapocalypseofeden\LunarDescent.fgd"
"TextureFormat" "5"
"MapFormat" "4"
"DefaultTextureScale" "0.250000"
"DefaultLightmapScale" "16"
"GameExe" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer\hl2.exe"
"DefaultSolidEntity" "func_detail"
"DefaultPointEntity" "info_player_start"
"BSP" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer\bin\vbsp.exe"
"Vis" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer\bin\vvis.exe"
"Light" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer\bin\vrad.exe"
"GameExeDir" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer"
"MapDir" "C:\Program Files (x86)\Steam\steamapps\common\Source SDK Base 2013 Singleplayer\sourcesdk_content\sourcetest\mapsrc"
"BSPDir" "C:\Program Files (x86)\Steam\steamapps\sourcemods\theapocalypseofeden\maps"
"CordonTexture" "tools\toolsskybox"
"MaterialExcludeCount" "0"
}
}