PureCutCNC is a 2.5D CAD / CAM workspace for designing parts, defining machining operations, previewing toolpaths, and checking the result in 3D and simulation before export.
PolyCut turns a 3D printer into a 2D cutting/drawing machine. Import SVGs or images and convert them to GCode for use with pens, knives, foil tools or other attachments. Think of it as an alternative to Cricut if you already have a capable machine.