From FreeCAD Documentation
- Defeaturing provides tools to edit STEP models by removing selected features.
- DynamicData allows creation of container objects for holding custom properties.
- WebTools contains a series of tools to communicate with Web services from within FreeCAD.
- Curves is a collection of tools to create and edit NURBS curves and surfaces.
- Nurbs is a collection of scripts for managing freeform surfaces and curves.
- Silk is a collection of NURBS surface modeling tools focused on low degree and seam continuity.
- GDT is a collection of tools to add geometric dimensioning and tolerancing (GDT) labels in 2D and 3D technical drawings. It implements the standard ISO 16792.
- InventorLoader is a workbench under construction designed to import Autodesk Inventor files. Currently only Parts (IPT) can be displayed, not assemblies (IAM) nor drawings (IDW).
- CadQuery allows users to write Python scripts, and is tailored to those based on the CadQuery CAD scripting API. Script variables can be edited dynamically through the use of a parameter dialog.