What is this?

Recently, Ive been hearing people mentioning “Gmod Plus”. Is this some sort of fan-made expansion of gmod, or is it like, the officially unofficial beta testing ground for gmod or something?

Well, I looked it up, and a thread here on Facepunch says it was a addon pack for Gmod 9, and it was supposed to have a Hell of alot of new stools and spawn menu’s. Although, the facepunch thread of it is now for gmod 10, so yeah, although i dont know the exact contents.