This is the fourth release candidate of FreeCAD 1.0
The most notable improvements over the 0.21 release series are:
* the inclusion of the topological naming problem mitigation code,
* an integrated assembly workbench,
* a new materials system,
* and many UI/UX improvements.
We expect to make three release candidates prior to the official release of 1.0 -- you can help by downloading and testing these candidates with your files and workflows, and reporting bugs on our GitHub repository.