current state of Cad/Cam software 2022, what works LinuxCNC etc

I forgot to mention WorkNc. What a system. Not much for cad but the window delete unwanted toolpaths is great. Nicknamed Work No Control because it jumps around so much. I can not say I have used very new version but past years this software took over in many die and mold companies. Easy to use but is only very strong for big files with many faces. The nc data it makes is fast to cut with no gouging. The 1st couple versions would violate sometimes but evolved into very reliable. Any one can learn to use it in a few hours . The king of rest milling. Company will drop off and train someone and fix a post for your machine then just leave the full version for a month to try. The cost per seat maybe shocking but return comes from ease of use and fast cutting. Another great French solution. Yeah seems like using so many systems over time makes me forget the best for 3d milling. Sescoi made this. www.worknc.com/worknc-informational-videos

Fast-forward 3 years, and FreeCAD is over the version 1.0 hump and the topo-problem has been resolved.  Seems many are still finding it hard to use effectively; perhaps a generational-gap between traditional (geometric) CAD and modern (parametric) CAD.

For 2.5D work from traditional CAD, take a look at QCAD-CAM:  www.qcad.org/en/products/qcad-cam
A quick CAM tutorial:  www.qcad.org/doc/qcadcam/QCADCAM_Tutorial_en.pdf

These pages really don't show off all the features and capability... QCAD is the mothership of the illegitimate LibreCAD; a full-featured (paid) CAD package which should be familiar to anybody with old-school CAD experience.  Free trial version available, reasonable cost / you own it, no cloud, no locks.  Import/export .DXF and many other common formats; has layers, line styles, hatching, blocks, extensive snaps / geometry / tools, dimensions, etc.  With the CAM add-on, there are like 50 pre-defined gcode export styles, including MACH and LinucCNC in both metric and imperial.  It also has an ECMAScript (JavaScript) post-processor that can further tweak the gcode to your heart's content: qcad.org/en/92-qcad-cam  It has an active user forum, with currently 43k posts and seven languages supported.