I'm useing python to do the plug-ins for Noesis.
I also have a python script that calculates Normals, Tangents and BiTangents should I need the reference.

Noesis already does the other format imports so I don't need to mess with to much.
I've also started an export plug-in for SWTOR useing Noesis.
It's a pretty robust little program.

Collada Next Gen or FBX are good formats. Collada is ASCII-based as well so you can easily convert them into binary files of your proprietary format.