Urban Terror. That's a game I haven't heard about in a long time. It must've been somewhere between 1998-2002 I played it. Damn, we even had a clan, and I played it on my Linux PC.
Does it still exist? If so, I probably get instantly killed if I dare to join any of the public servers...
Apparently it is still under development: https://www.urbanterror.info/news/blogs/ (last post is from 11 days ago).
There are players, too: "Online: 208 servers with 109 players" at this time.[1]
Fun times for sure! Bomb was my favorite game type. :)