Genymotion is a powerful and fast android emulator, which you can use to test your applications. This is an Open source project which claims to be the fastest android emulator available as of now.
Features
Fast
Sensors like battery, GPS, accelerometer, Temperature, Rotation Vector etc.
Command line tools
Development Environment Integration
Wifi, 3G, Bluetooth, GPS
Compatible with Linux, Windows and Mac
Few screenshots
You will have to create an account to use this application. read more and create account here on the home page