2018: -verified- !!top!! Xforce Artcam

There are open-source 3D modeling and CNC software available that might not offer the exact same features but could serve your purposes.

ArtCAM is an integrated design-to-manufacture application aimed at decorative woodworking, sign-making, jewelry, and other relief-based CAD/CAM workflows. The 2018 release continued focus on sculpting reliefs from bitmap or vector artwork, converting those designs to toolpaths, and exporting G-code for CNC routers, mills, and engraving machines. -VERIFIED- Xforce Artcam 2018