Any recommendation on good options analytics software ? I'm looking for something that allows me to compare various options for volatility, based on strike, time to expiration etc to better determine which options to buy/sell at any given time. I don't need real-time connectivity, as I only trade once in a while and can enter strike, time, and underlying manually. I currently have OptionScope that comes with MetaStock, and that doesn't have much functionality. Even a package in Excel could be sufficient. Thanks in advance !