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Amazon.com: CAD-CAM CNC Lathe Software for Mach 3-4, Linux CNC, EMC2, Fanuc, Sherline CNC. Design your part and generate the g-code with a single easy to use software, plus many tutorial training
LinuxCNC - CNC machine controller - LinuxLinks
CNC Direct. - LinuxCNC Direct
Installing LinuxCNC (Formerly EMC2) for Windows Tutorial - YouTube