Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
Cura - Cura aims to be a end solution for personal 3D printing with RepRap based machines.
3D Object Converter - 3D Object Converter, a powerful 3d polygon model translation and interactive viewing shareware tool...
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Skanect - The Easiest Way To 3D Scan With the Structure Sensor and Kinect-like 3D Sensors
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.