Software

Modelado 2D/3D (-> Slice) -> G-code -> LPT/USB/Firmware

Openscad -> pycam -> linuxcnc on a CNC router and mill

Modelado

LibreCAD

OpenSCAD

ImplicitCAD

FreeCAD

Solvespace

Blender

Slicer

http://reprap.org/wiki/Slicer

G-code generator

Simulation

LPT/USB/Firmware