I found out that you can download Garry's Mod 10, 11 or 12 for free if you own the current version in your Steam Library. Fired up Gmod 10 and made this. : r/gmod

Steam Workshop::the gmod

Garry's Mod on Steam

Steam Workshop::Better Garry's Mod 13

steam - If I buy Garry's Mod, will I need other games to play it? - Arqade

Steam Workshop::Garry's Mod: Realism Overhaul Collection List (WIP)

Steam Workshop::Addons for Friends

Atelier Steam::GMOD MODS

GMod - How To Download Steam Addons Without Subscribing

Steam Workshop::garrys mod stuff

Garry's Mod on Steam

Steam Workshop::GMOD collection

Steam Workshop::Halo's Gmod Things For Friends