GZDoom is one of the most popular modern Doom source ports, but hosting a smooth multiplayer server in 2026 is a little different from renting a normal "game server" panel. Classic GZDoom multiplayer is more peer-to-peer oriented, while many public Doom multiplayer communities use client/server ports such as Zandronum, Q-Zandronum, Odamex, or compatible Doom server browsers like Doomseeker.