There really isn't anything. For at least a couple of years, Fusion 360 has been available for "free" (users had only community support, had to write their own

There really isn't anything. For at least a couple of years, Fusion 360 has been available for "free" (users had only community support, had to write their own POSTs for cam, etc) so as far as I know no one has been developing or considering writing anything else. One thing that's been needed for years in the open source space is a decent mechanical CAD program and integrated CAM system. The issue is that such things are still dark arts to write. There are open source projects that are out there, including BRLCAD, Blender, and other special purpose programs. Fusion 360 is head and shoulders above them in terms of usability and integration with the CAM system.