With the pandemic in full swing, helium is rather expensive and has been difficult to get. I’ve therefore been keeping track of suppliers and their offerings on a map.
This map is built using uMap, a free and open source tool built on OpenStreetMap. I’m rather fond of it. It allows you to pick a tile layer and even customize the look of the arrows, as I did on this service map for Futel. In addition to the web management interface, all the entries can be stored in and updated by from a CSV file, allowing version control.