A free program for Android, by Eccentrica Technologies.

Speedometer for Android is a free app to measure the speed of anything, be it a car, bicycle, train, boat, airplane, helicopter, motorcycle, or even a walking person. The application can be used in any environment, whether it is an open road, a city, a village, a desert, or even a snowy or mountainous terrain.

The application is extremely simple and easy to use. First, you have to install it on your device, and then you can use it to measure the speed of anything that you want. To do that, simply launch the application, and then you will be presented with a screen that will ask you for the type of measurement you want to perform. After that, you will be presented with the speed in miles per hour, kilometers per hour, or meters per hour.