During a 2 days hackathon that took place this week at IGN, we made a very first version of a very simple visual tool to link OSM object with Panoramax pictures.
You can have a look at it on:
https://panolinker.panoramax.fr
An OSM objet with photos nearby is selected randomly, and you can select the best picture available showing the object, and also reframe it when it is a 360° picture (this information is stored).
The link is not yet pushed back on OSM (panoramax=* tags) and Panoramax, but a uMap can show them:
The source code is available at: Panoramax / Clients / Panolinker · GitLab