Black Scholes
Example
Free.  Non-working example.
Black Scholes
With Dividends
Black Scholes
With Dividends and Greeks
Black Scholes Options Pricing Formula ( European )
These spreadsheets calculate CALL and PUT prices given S, E, r, σ, T and dividends:
i.e. underlying price, strike (exercise) price, risk free interest rate, volatility and time until expiration.