There are 1 repository under garrysmod-map topic.
The Skeld map for Garry's Mod Among Us by NotMyWing
A DarkRP map for Garry's Mod, loosely based off of rp_downtown and it's derivatives.
.bsp Valve Source Engine maps editor without decompile, running inside Garry's Mod
stab people.
A Murder map for Garry's Mod, taking place in an old industrial building that's been converted into a theater.
This project contains a very old Garry's Mod map project for designed originally for use by ELGCommunity.