Just a software I've found to allow you to hook up with players to play various popular games online in a lobby based. It's free and supports games like DOOM. Especially quake series, dukenukem3d, blocktrix, and more.
Site: playerconnector.com
Download:
http://www.playerconnector.com/temp/Player_Connector_Setup.exe
Site: playerconnector.com
Download:
http://www.playerconnector.com/temp/Player_Connector_Setup.exe