So I released a few Financial applications yesterday - namely the Black Scholes Calculator and the Implied Volatility Calculator.
For the Black Scholes calculator, input the initial stock price, the risk free interest rate, the volatility, maturity, and strike price, and it will calculate the option price for both the European Call/Put option, as well as the Greeks.
For the Implied Volatility calculator, input the initial stock price, interest rate, volatility, maturity, strike price, and asking price, and it uses Newton's method to find the implied volatility of that stock.
There is a LITE version for both, but in the Full Version (for either applications), in addition to pulling the latest risk-free interest rate, you can import real time stock data (based on stock quote) and also real time option data (based on option symbol).
Here are some screen shots of the two applications: