GCAM is the free GNU Computer Aided Manufacturing package. Most 3-Axis Computer Numerically Controlled (CNC) mills such as the Taig, Sherline and Haas are supported in both english and metric units. GCAM has a simple interface for making bolt holes, drill holes, sketches, templates, and more. After extruding these entities one can export the corresponding G-code for the selected cutting tool(s).

WWW: http://gcam.js.cx/wiki/Main_Page
