meshlab

alain

http://meshlab.sourceforge.net/

Quote:

MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes.

Features
Interactive selection and deletion of portion of the mesh. Even for large models.
Painting interface for selecting, smoothing and coloring meshes.
Input/output in many formats:
import:PLY, STL, OFF, OBJ, 3DS, COLLADA, PTX
export:PLY, STL, OFF, OBJ, 3DS, COLLADA, VRML, DXF
Point Clouds support. Now 3D files that are composed only by points are well supported in PLY and OBJ format.
U3D support; MeshLab is the first open source tool to provide direct conversion of 3D meshes into the U3D format. Now you can create pdf, like this with 3D objects with just MeshLab and LaTeX.

etc

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http://mixed3d.net/