DXF2GCODE: converting 2D dxf drawings to CNC machine compatible G-Code
LaserGRBL Linux solution, LaserGRBL is one of the best software.
cppcam is a 3D CAD app for drafting G-Code toolpaths for CNC Routers
Helps with the Mach3 CNC Threading functionality
3D CAM program for CNC mills/lathes
Android app to control the Red CNC 3D routing machine