Following the article on configuring Urban Terror, a popular first-person shooter game based on the ioQuake3 engine, here is a guide for configuring the original ioQuake3 game, including customisation of cvars, using new maps, weapons and characters models, and more.

Wolfenstein: Enemy Territory
A true classic and one of the most played online first-person shooter games, Wolfenstein: ET was supposed to be released as a new mod for Return to Castle Wolfenstein, but the single-player part of the game was abandoned and it was released at no cost, as a standalone multiplayer game.