Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
Online 3D Model Converter - free online 3D model converter, upload a model and export it into popular formats
Repetier - Software for controlling RepRap style 3D-printer like Mendel, Darwin or Prusa mendel.
3D Object Converter - 3D Object Converter, a powerful 3d polygon model translation and interactive viewing shareware tool...
MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Skanect - The Easiest Way To 3D Scan With the Structure Sensor and Kinect-like 3D Sensors