This is not a zym exporter or a smd exporter really although it exports both formats.
What it DOES:
For SMD export it takes your selected mesh, attaches Bone01 at the origin and outputs a SMD mesh.
For ZYM export

Download:
http://xoopstuner.com/nex/Blender-Nexuiz-weapon-export-prealpha.zip
Crylink with spikes:

Blender Interface:
