Yep I've contributed a fair few Mapillary images! I like that OpenStreetMap integrates with it well; I don't like that it no longer shows _who_ contributed an image (whether in the OSM viewer or the Mapillary viewer).

I believe OpenDroneMap uses OpenSfM which Mapillary open sourced:

https://blog.mapillary.com/update/2016/10/31/denser-3d-point...

> OpenSfM is also used internally by the OpenDroneMap project. OpenDroneMap creates 3D models and orthophotos from drone imagery. It includes all the steps of the pipeline so one can go from images to 3D models in one command. It uses OpenSfM to get the camera positions, and can now use it to compute the dense point clouds as well.