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Meshmixer is an Ogre-Frontend implementation for OAIL
http://wiki.github.com/johnfredcee/meshmixer

OAIL:
http://assimp.sourceforge.net/index.html

Open Asset Import Library (Short name: Assimp) is a free library to import various well-known 3D model formats into applications. The library has been designed for maximum stability and efficiency. Written in C++, it is licensed under the BSD license.

File Formats

ASSIMP currently supports the following file formats:
CAD/3D Modelling file formats

* Collada ( *.dae )
* 3D Studio Max 3DS ( *.3ds )
* 3D Studio Max ASE ( *.ase )
* Wavefront Object ( *.obj )
* Stanford Polygon Library ( *.ply )
* AutoCAD DXF ( *.dxf )
* LightWave ( *.lwo )
* Stereolithography ( *.stl )
* AC3D ( *.ac )

Game file formats

* Valve Model ( *.smd,*.vta )
* Quake I ( *.mdl )
* Quake II ( *.md2 )
* Quake III ( *.md3 )
* Return to Castle Wolfenstein ( *.mdc )
* Doom 3 ( *.md5 )

Motion Capture

* Biovision BVH ( *.bvh )

Other file formats

* DirectX X ( *.x ).
* Quick3D ( *.q3d ).
* Irrlicht Mesh ( *.irrmesh ).
* Neutral File Format ( *.nff )
* Sense8 WorldToolKit ( *.nff )
* Object File Format ( *.off )
* PovRAY Raw ( *.raw )
* Terragen Terrain ( *.ter )
* 3D GameStudio ( *.mdl )
* 3D GameStudio Terrain ( *.hmp )
(All sub versions of 3D GameStudio models/terrains are supported: mdl2, mdl3, mdl4, mdl5, mdl7, hmp4, hmp5, hmp7)