I created an option price calculator in Excel, willing to share for free if wanted! : r/options
Bull Spread Calculator! - YouTube
Options calculator, itcOptionsCalculator is an indicator to display important support/resistance levels intra-day for stocks traders with Ninja Trader 8
The Expected Return Calculator - Evaluate and Graph Option Trades | Option Strategist
Calculating Option Strategy Payoff in Excel - Macroption
Using the Free Trade Calculator to Profit on Call and Put Spreads
Option Profit Calculator : Review of OptionStrat
An Easy-to-Use Spread Betting Calculator - Shifting Shares