Opensource forum seems the most current.
- https://www.rtai.org/
- https://github.com/prusa3d/PrusaSlicer
- https://forum.linuxcnc.org/9-installing-linuxcnc
- https://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNCVersion2
- https://linuxcnc.org/docs/2.8/html/getting-started/about-linuxcnc.html
- http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Mechanical_Spreadsheet