Taxi Auto Fare
Taxi Auto Fare is a Google Maps based taxi fare calculator that works for a large number of cities in India.
To calculate a fare just enter a starting point and a destination and Taxi Auto Fare will plot the route on Google Maps and work out an estimated cost for the journey. One really nice feature of Taxi Auto Fare is the inclusion of draggable routes. If you are unhappy with the route plotted by Google Maps Driving Directions you can drag the route to alter it.
The Taxi Auto Fare team are also planning to soon extend the service to more cities in India.