Hello,

I finished an other project some days ago: A new version of my software MB-Ruler, that was originally developed for measuring distances on the screen.
For the new version MB-Ruler 4.0 I added the support of OSM map data and measuring the distance between two points and the length of polylines in the map. And it draws the real trace of the distance - section of a great circle - between two points.
Please have a look at the wiki article
osm.wiki/MB-Ruler
for details.

Regards

Markus