OpenStreetMap is a map of the world, created by people like you and free to use under an open licence. I have started to add some map info for parts of my local area. Hopefully others can do the same. To this end, I have included some useful links below.
OSM can be used in many areas, and both contributing or even using the data could make a useful project too.
Links
Open Street Map
Street Complete
Street Complete App (Android)
JOSM Software for map editing
Open Street Map UK Community
OSM Matrix Room
Mastodon