Apps similar to tkCNC Editor include Blender CAM, which is free and open source. Other options are PyCAM and ECam. In total there are three CAD Software like tkCNC Editor for Windows, Linux and Mac.
Blender CAM is an open source solution for artistic CAM - Computer aided machining - a g-code generation tool.
Blender CAM is an add-on for the free open-source Blender 3d package.
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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.
ECAM is a programming system for CNC lathes and machining centers. He combines features of CAD / CAM systems with typical features of conversational programming.
