Free Download GMOD for Mac - A handy, free and open-source set of utilities specially designed to provide the necessary tools for creating and hand. We have one of the most vibrant Steam Community Workshops, with over 300'000 models, maps, and contraptions to download. It has everything from new tools to improve your builds, to guns that fire rainbow-tinged nuclear blasts from space.
Yes, Team Garry (Developers) have released a version of Garry'sMod for Apple Mac via the games platform Steam速 (by The ValveCorporation)