Warsow

Yet another open source first-person shooter from the Ubuntu repositories, Warsow distinguishes itself because of its cel-shading presentation and because of its fast loading times. Of the three shooters I've tried under Ubuntu, Warsow came up the fastest. Its cartoonish presentation also marks a refreshing change from the typically dark and grimy environs we've come to expect from games like this.

Warsow's emphasis, like Nexuiz, is on multiplayer.