Welcome to Catalyst-Gaming, iHarvey. Hope you enjoy the servers.
Here is a list of the GMod servers:
Harbor RP
server.catalyst-gami?ng.net?:27015
GMod Racer
server.catalyst-gami?ng.net?:27045
Half Life 2 RP
server.catalyst-gami?ng.net?:27035
You can also head to the "Servers" tab at the top of the page to view bans, and other servers.