Power users have extended FreeCAD with various custom external workbenches, that are not integrated into the FreeCAD source code (yet!), but are easy to install on an existing FreeCAD installation. Instructions are provided on the pages linked below:
TODO:
- Bolts
- Cfd
- EaglePCB_2_FreeCAD
- Gears
- FreeCAD-CuraEngine
- Animation
- Lattice
- Lattice2
- Exploded Animation
- Fasteners
- Flamingo
- GeoData
- Nurbs
- Persistent toolbars
- Retr3D
- Sheetmetal
- Timber
- Manipulator
- Kicad StepUp
- WebTools
Assembly2
The Assembly 2 workbench provides tools to create multi-part assemblies, and is a very good alternative for the official Assembly workbench which is still under development (see forum thread).
Drawing Dimensioning
The Drawing dimensioning workbench adds powerful dimensioning and annotation tools to the Drawing workbench (see forum thread).
Work Features
The WorkFeature macro adds a wide range of helper objects such as alignment planes or axes, and tools to help you to position and align objects along those helper objects (see forum thread).
See 
Macro WorkFeatures in the wiki.
