This is a rather empty post, just some sad news. BZflag is an open source online 3D tank game which was developed (and played) since ~1993. The last version from the 2.0 branch (2.0.16) was released in April 2010 and still there is quite a number of active players. However, the development of a long-awaited 3.0 branch is stalled and definitely is not going to be resumed.
Now some talks are being held to replace BZFlag with a new project. I hope for a glorious return of BZFLag.