Just a few tools I'm working on. Some of them I start just for my own for needs, some of them starts just as an experiment and my learning with FreeCAD.
TechDraw templates (mp) according to ISO 5457 and ISO 7200 rules. More less. The templates has been generated by python script (included).
Mannequin (mp) - set of human like dummy dolls. This set of dummies/dolls is dedicated for FreeCAD assemblies (Assembly4 primarily) as simple addons for visualisation and for basic ergonomy studies. These dummies are part of FreeCAD Parts Library.
Fasteners (mp). This is library for FreeCAD (Assembly4) with the most common and standardised fasteners for mechanical engineering. This library is based mostly on ISO metric parts and some DIN parts. Each individual fastenner has its own file. Purpose of this library is to have parts for mechanical assemblies and drawings. The parts should be reasonably simplified. For example, no fully modeled threads, no stampings on heads of bolts, ...