112
Me before I learned how to use JOSM
(lemmy.ca)
Overview:
Discussion on the Openstreetmap service that has the most open map data that began in 2004.
Apps:
JOSM: Map editor
Comaps: Offline maps that's great for walking/hiking/cycling
Magic Earth: Great for driving
Related:
Well, okay. Color me ignorant! Looking at that now.
My personal experience is that I feel that as an overlay in OSMAnd it is not as up to date in realtime terms as the traffic layer in gmaps. I might be wrong though, I don't use it as much.