Can anyone recommend a good tool for keeping track of maps? I want to run an Eberron setting game, and I'd like to use the Eberron map, which I have as a high-resolution png, but be able to add quick notes and such as the game progresses. Something similar to Google Maps.
I have already considered using the Google Maps API, but I wanted to look for a simpler solution first.
The map can be seen here.