BZFlag version 2.4.2 "Doomsday Edition" is the current maintenance version of the BZFlag game for Windows, Mac OS X, and Linux. It was released on 07/28/2012 and contains some new features that are compatible with the BZFlag 2.4.0 release.
The new features include:
- server UPnP support
- thiefControl plugin
- fairCTF plugin
- autoFlagReset plugin
- Fastmap plugin
- combined leading and lagging radar shot lines
- option for chat on the left and radar on the right
- joystick hat support
The full change log can be found at https://github.com/BZFlag-Dev/bzflag/blob/2.4/ChangeLog.