Maine Open GIS data

https://gis.maine.gov/arcgis/rest/services/dot/MaineDOT_OpenData/MapServer

and the Maine data catalog:

https://www.maine.gov/geolib/catalog.html

From this reddit thread

Would love to make some maps from this!

Maine town boundaries: https://maine.hub.arcgis.com/datasets/b0c7b943162f45e48b3a829b7f35709a/explore?location=45.110031%2C-68.974254%2C8.26

available as geojson