Meshtastic is cool I wish there were more public users around me.

OpenStreetMap and their editors are great and I use them a lot, but if you really want to have great flexibility with your map design QGIS is Open Source

Here’s a video on how to use it

You can use CalTopo’s print pdf to print that OSM data too

The link worked for me the first time but only once

It can be hard to find fediverse instances and content inside of them. They are working to make things easier to search for on Mastadon. With a little work it could be used with (and between) many things on the fediverse!