Perhaps look into The Night Sky personalised sky charts! Not sure if they make phone cases, but you can order custom portraits or jewellery by entering the date when you order :). Source: over 1 year ago

I need to code a product personalizer similar to thenightsky.com. Source: over 2 years ago

I haven't tried but I bet you could also import it into a uMap. Source: about 1 year ago

If you prefer not to use proprietary, walled-off services like Strava I recommend Umap which has some great map editing Functionality and allows sharing links or even exporting the maps as JSON. Source: over 1 year ago

I'm not hosting it myself but I'm using the open-source OSM uMap (https://umap.openstreetmap.fr/en/) with a custom layer that points to a GeoJSON endpoint on my webserver. Source: over 1 year ago

That being said, http://umap.openstreetmap.fr/en/ exists. This is a website where one can make a small map, personal or shared with friends who can edit. Source: over 1 year ago

Open Street Map iframe of a custom map (https://umap.openstreetmap.fr/en/) with an external layer that points to an endpoint on my server. The server takes my database of points/labels/etc and serves it in GeoJSON format for OSM to understand and render. Source: over 1 year ago