[detourdog]

What about GRASS?

https://grass.osgeo.org

[boxerab]

Yes, that's one missing piece. Excellent software but there is a steep learning curve, and it has its own format that you need to convert back and forth from.

[zokier]

GRASS is integrated to QGIS https://docs.qgis.org/3.40/en/docs/user_manual/grass_integra...