BZW Exporter for Wings3D
The BZW Exporter for Wings3D was written by trepan so that users of Wings3D could export their 3D models to BZFlag world files.
You can download the plugin here. To install, save the .tar.gz to your computer and simply hit File->Install Plugin. Then, select the .tar.gz file which you saved to your local machine.
The BZW export plugin will work on any operating system that supports Wings3D.