I also forgot Step importer and a few others

This may be of interest if you are exporting from Moi to blender vis step files
https://blenderartists.org/t/step-import/1203804

Also Quad Remsher. It's not free but it's the same quad remesher as in Zbrush and is very useful.
https://blenderartists.org/t/quad-remesher-auto-retopologizer/1170913

Volume preserve smoothing. Smooths out the vertexes with affecting the outside shape of object.
https://blenderartists.org/t/volume-preserving-smoothing/1115522/37