I came across this a few days ago and signed up for the free 'essentials' version. The company also offers trials to their several paid versions. So far, I'm impressed. It has a clean layout, it's intuitive and it includes the CME serials, weeklies and short-dates that are sometimes hard to find. And the skew feature is nice - multiple months on one chart or you can select a single month and scroll back through time to see how the current skew compares to a day ago, a week ago, etc. The free version appears to be end-of-day for volatility data: the ATM table, straddles and skew - but I think the individual option prices update at the exchange-mandated delay. Anyway, might be worth a look. I'm going to keep poking around and maybe I'll demo one of the paid versions. I haven't looked at the spread or pricing tools but was pleasantly surprised to find the ATM tables and skew graphs for free. http://www.quikstrike.net/ P.S. I have no affiliation with the CME or with QuikStrike but I hope they keep this stripped down product available for free. It's the least they (the CME) can do after taking down their nice energy spread page.