The Helis.com website provides public domain information on individual helicopters, models and variants, as well as the organizations that operate them.
Since 1997, the Helicopter History Site has provided freely accessible information on all aspects of helicopters and vertical flight.
Featured sections of the website include history of helicopter manufacturers, industry news, and an ever-growing database of over 50,000 individual helicopters.

With this app, aviation spotters can now upload helicopter photos to the helis.com database in an easier way.