DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
cppcam is a 3D CAD app for drafting G-Code toolpaths for CNC Routers
AVR simulator IDE
Open Source Digital Laboratory - CAM module
A CAD/CAM Package for CNC GCode Creation
Cuts 3D objects from polystyrene foam (EPS/XPS)
qnutCNC is a program to control the ethernut development board
GCVE : 'Grbl Controller Visualizer Extended'