This is a distribution of FreeCAD 0.22 (the current developer version) with the Ondsel Lens collaboration tools preinstalled; so far I have not seen anything else that is unique to them.
Ondsel are a big part of some of the biggest improvements in recent FreeCAD versions, among them the integrated assembly workbench, some significant improvements in Sketcher, and they are organising the continued work towards mitigating the Topological Naming Problem.
The TNP mitigation is not complete yet; the developers are still progressing this.
