Meshlab 1.3.1

The free opens source software Meshlab is a great tool for the processing and editing of unstructured 3D triangular meshes (3D scan data). But because it has the ability to open a variety of formats and is multiplatform it serves nice as a 3D viewer or 3D converter too.
It is Open Source and available for Windows, OS X and Linux.

More infos and download at www.meshlab.sourceforge.net