Garry’s Mod is a sandbox physics game where players can create and manipulate objects in a virtual world. It was developed by Facepunch Studios and released in 2004.
Coolvetica, a display font designed by Canadian Ray Larabie, was likely used for the Gmod game logo. The original 1999 version had a swash G, while the updated version has a "stylistic alternate" G. Both are available for download in the Fonts Used section.