Inkarnate is a mapping tool. I haven’t explored the ins and outs of it, yet, but I’m using it now.
At this moment, it’s in Beta sign up stage, and is usable. I have no idea what the price will be later.
I have to mess with it some more to see if I can use it to build cities. You can presently place cities on a map, from what I’ve seen. I don’t know about anything else.