you mean like with a server browser and stuff like that?
maybe discord? im not sure i dont use it but i think that is a "gamer chat client" or something along those lines.
steam also offers a server browser but of course you have to buy q3 on steam and even then im not sure about version selection (i think it installs the latest patch 1.32 and you have to use a version switcher for 1.16n)
hope someone else can chime in....