Blender - Blender is the open source, cross platform suite of tools for 3D creation.
CloudCompare - CloudCompare is a 3D point cloud (and triangular mesh) processing software.
FreeCAD - An open-source parametric 3D modeler
Autodesk ReCap - View, Segment, register and convert point cloud data from laser scans
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
ContextCapture - Acute3D develops breakthrough photogrammetry software solutions to automatically turn photos into photorealistic high resolution 3D models