Microflight was developed by Ilan Papini in 2000.
The default aircraft include an Ultralight, Hanglider and Sailplane. The open architecture and realistic physics of the sim has encouraged a plethora of add-ons such as Helicopters, World War I aircraft, more Ultralights, Cessnas, - a flying car! - kit planes, recreational vehicles and even a bicycle!
As well as the default European scenery you can download Grand Canyon scenery, Cyprus, Carmel, Dead Sea and San Francisco.
There is more info, images and a free demo at Ilan Papini's site: www.hangsim.com