CloudCompare - CloudCompare is a 3D point cloud (and triangular mesh) processing software.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Autodesk ReCap - View, Segment, register and convert point cloud data from laser scans
FreeCAD - An open-source parametric 3D modeler
ContextCapture - Acute3D develops breakthrough photogrammetry software solutions to automatically turn photos into photorealistic high resolution 3D models
SketchUp - 3D for Everyone