HR
A Blender add-on that imports STEP and STP CAD files with adjustable tessellation and a live link to the source.
HR plugins
HR has 3 plugins in the catalog for Blender.
HR
Blender add-on that finds and removes circular through-holes in imported CAD meshes to reduce polygon counts.
HR
Locates, lets you review and deletes duplicate or overlapping mesh objects in Blender, handy after importing CAD files.