im sure there are have your tried googlemaps lol. Also type may in the search bar and look that way, might find what your looking for
There are a couple as far as I recall they all use the google map api (so do dynmap), as jamescosten suggests try to search.
dynmap is the only bukkit plugin map. Any other will require you to render the map tiles with a seperate program and then a webserver to host them. dynmap is by far the easier solution, even though the configuration can be a little challenging.