Addons

Garry's Mod uses a custom format called GMA (Garry's Mod Addon) to store addon contents. These files can be extracted with the GMAD.EXE utility which can be found at [ game_directory] / bin /.

INFO

The source code for the utility is available on GitHub. If you do not own Garry's Mod, you can try compiling the tool yourself from the repository.