AirMap is a free, comprehensive digital map that allows unmanned aircraft system (UAS) operators to visualize the airspace around them, including areas where they may not be permitted to fly. Airspace rules are complex. AirMap removes barriers to compliance by providing the low altitude airspace information that unmanned aircraft operators need.
AirMap was cofounded by aviation expert and entrepreneur Ben Marcus and Dr. Gregory McNeal, a leading legal scholar on drones, public policy and air rights.
– See more at: http://www.uasvision.com/2015/05/01/airmap-launches-free-comprehensive-airspace-database-for-unmanned-aircraft-operators/#more-36711
Courtesy UAS Vision
Note: Only good for the US at this stage !!