LeoCAD - LeoCAD is a CAD program for creating virtual LEGO models.
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
LDraw - LDraw is an open standard for LEGO CAD programs that allow the user to create virtual LEGO models...
MeshLab - System for processing and editing 3D triangular meshes, provides a set of tools for editing...
Stud.io - Build LEGO designs online with friends.
Skanect - The Easiest Way To 3D Scan With the Structure Sensor and Kinect-like 3D Sensors