AssaultCube is a free first-person-shooter based on the game Cube. It’s set in a realistic-looking environment, while gameplay stays fast and arcade-like. This game is all about team oriented multiplayer fun. You can place it on your USB flash drive, iPod, portable hard drive and use it on any computer.

Features

AssaultCube is a free and open source first-person shooter with the following features:

• AssaultCube is fast and runs on old hardware, with the correct settings you can run it on a P3 800Mhz gf2
• Thanks to the efficient networking code, AssaultCube requires very little bandwidth, you can play it with a 56k modem internet connection.
• Create new maps (virtual worlds) together with other people online. The cooperative editmode makes it possible… 

Home page: http://assault.cubers.net/download.html

Download free AssaultCube portable here