Garry's Mod 2 May Actually Be In The Works Right Now –

It appears that Garry's Mod 2 may actually be in the works right now as the creator, Garry Newman, has started teasing it on social media.

Steam Community :: Guide :: How to port TF2 Maps into Garry's Mod

Garry's Mod 2 is here, and it's called Teardown

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Garry's Mod 9 : Garry Newman : Free Download, Borrow, and Streaming : Internet Archive

GMOD 9.0.4 file - Garrys Mod for Half-Life 2 - ModDB

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Garry's Mod sequel is sort of confirmed

After 18 years, the precursor to Garry's Mod appears on Steam

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Growing Pains (Ninjala/SMG4 GMOD) by MasterPerryMartin on DeviantArt