Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ContextCapture - Acute3D develops breakthrough photogrammetry software solutions to automatically turn photos into photorealistic high resolution 3D models
FreeCAD - An open-source parametric 3D modeler
Pix4Dmapper - Photogrammetry software for professional drone-based mapping, purely from images.
meshmixer - meshmixer is an experimental 3D modeling tool for making 3D mashups without too much hassle.
Meshroom - Meshroom is a free, open-source 3D Reconstruction Software based on the AliceVision framework.