Requires Unity 4.0.0 or higher.
Features
One click mesh combine tool
Easily combine meshes by attaching this script to a GameObject containing meshes with the same material.
Click the Combine button to merge meshes.
To decombine just click the Release button.
Easily decrease draw calls to improve game performance.
Version 1.6
Added Export to OBJ (Beta)
Added Copy Colliders function
Easily create new prefabs with combined mesh