Is there any good option software or service that you can't trade without and is worth every penny? I'm looking for user friendly analytical info in real time (Greeks, probability, P/L, etc.) that can help you to pick the best option strategy based on your opinion on the underlying stock or market? Thanks!
look at raw option chains for about a year before you sign over your life to source code http://www.schaeffersresearch.com/streetools/options/greeks.aspx http://www.prophet.net/quotes/options.jsp http://www.ivolatility.com/
ditto...and disagree a bit with Xr...I can't program and am an idiot with math. I do however understand probabilities and for me the probability of expiring in or out of the money and the IV are the two functions on the TOS platform's I trust the most to make me money and so far so good.