Forge: CAD Precision Modelling adds professional NURBS and BRep CAD modeling to Blender, installed as an add-on. It's aimed at designing complex hard-surface parts, and it handles fillets, live booleans, and zero-retopology quad mesh conversion directly inside Blender. STEP and IGES import and export are included, so CAD geometry can move into Blender and back out to other tools that read those formats.
The add-on lists compatibility with Blender versions 4.2 through 5.0 and uses the Blender-Internal render engine. It's released under the GPL. It has recorded over 100 sales on superhive since it was published.
The listing includes documentation, product updates, and support from RenderCraftStudio, and the support period can be extended for additional months of coverage. A demo video is also available.