Steam Community :: Guide :: Setting Up a Dedicated Server on Linux

Garry's Mod on Steam

Garry's Mod, Yogscast Wiki

Garry's Mod - SteamGridDB

Steam Community :: Guide :: How To Add Custom Background Main Menu in Garry's Mod

Yes, Garry's Mod is playable in the Steam Deck, even though Valve says it's unsupported!

my humor is so broken that I find making the Garry's Mod logo super small on my Steam library hilarious : r/gmod

Steam Workshop::Garry's Mod Classic Collection

Creating a workshop collection on Steam - Nitrous Networks

Garry's Mod Steam Charts & Stats

Steam Workshop::GMOD Stuff