PyCAM is a toolpath generator for 3-axis CNC machining. It loads
3D models in STL format or 2D contour models from DXF or SVG files.
The resulting GCode can be used with EMC2 or any other machine
controller.

PyCAM supports a wide range of toolpath strategies for 3D models
and 2D contour models.

WWW: http://pycam.sourceforge.net/