Meshlab

MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. The system is aimed to help the processing of the typical not-so-small unstructured models arising in 3D scanning, providing a set of tools for editing, cleaning, healing, inspecting, rendering and converting this kind of meshes.

http://meshlab.sourceforge.net/

OSE Use

• Simplifying files is useful, as sometimes FreeCAD takes too long or breaks with certain mesh files.
• See simplifying meshes video tutorial - [1]