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Could someone give recommendations regarding volatility tools / web sites that they find useful? I am looking for information that my brokerage platform does not provide. Specifically, I want to see strike / time skews on options and, if available, accurate measures of 2nd order Greeks. Real time would be preferred but I'll settle for end-of-day if necessary. So far, I have found the following:

iVolatility.com Optionistics.com

I also explored www.volcube.com, which I found to be an interesting training site but I wasn't sure how valuable it would be to continue down their training/gaming system. If anyone could speak to that I would be grateful. I did find their articles very helpful.

I don't mind paying a reasonable subscription price for a good service.

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iVolatility and OptionMetrics are arguably the most widely used. I don't know much about the greeks calculations as I assume most people have proprietary tools to make calculations themselves. OM provides 1st order greeks AFAIK. – sashkello Mar 12 '14 at 2:20

www.livevol.com seems to offer good services but it seems pretty expensive. It all depends on your needs. It is probably a good service for semi-professional option trader.

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