If you want to play only with your friends, setting up a password protected serves is the best alternative.

When creating local servers, you get to choose the map you want to use, to setup time limits, the maximum number of players, to define an access password, and so on. In the first instance, you might have to download additional maps and other content. To start playing the Tremulous game, you must either connect to one of the available public servers (Tremulous will automatically scan and display the list of online servers), or create a local one. User friendly FPS game featuring a fast paced gameplay The game also integrates real-time strategy elements and can be played on online or local servers.

Tremulous is an engaging first person shooter game that has been developed on the ioquake3 game engine.