Earlier post here: SO3: Anyone Using Artcam? - #5 by WillAdams
The wiki has a link for it: Shapeoko CNC Router, Rigid, Accurate, Reliable, and Affordable
Which says:
ArtCAM[47] — Use Mach3 PP for Shapeoko2 and GRBL[48]
Linking to: Shapeoko CNC Router, Rigid, Accurate, Reliable, and Affordable in the latter footnote.