Do you love shooters to play online? You can't miss Urban Terror! Based on the Quake 3 graphics engine, it features many different maps that you can play alone or with friends, even on a LAN.
For a guide on how to play Urban Terror: fribby.net/urban-terror/?lang=en
Urban Terror Official Page: urbanterror.info/
Free Download Urban Terror for Windows, Mac and Linux, all files are contained within the zip file:
File
License terms
Urban Terror is a mod for Quake 3 Arena. Urban Terror can be freely distributed over the internet, unmodified, without charging for the product. Urban Terror uses the Quake 3 SDK license. This means the game code (the .qvm's in zpak000.pk3) are closed source and can only be distributed electronically over the internet, not on cd or dvd. The non-code data files of Urban Terror (zpak000-assets.pk3) can go on any medium however. The full license texts come with the installer, they outweigh the information provided here.