Opentick: free real-time and historical market data for trading systems and trading platforms

This has been around for at least a few years. It's cool, but I'll warn you that some of the data isn't super-clean. IIRC, there were a few daily data holes, and even more so in the intraday data<p>However, for the price, it's pretty awesome to play around with.

This is awesome! Google has been promising this for over a year and have delivered nothing. Great that someone else managed to release the data!

Not exactly open source:<p>"Can I redistribute the market data? Unfortunately, at this time, opentick does not allow redistribution of the data due to various rules and regulations. However, when this possible, we would be happy to notify you." (from the FAQ)<p>but still, this is awesome... becoming a quant millionaire just got a whole lot easier ;)

There's a Python wrapper to the C++ API floating around too<p><a href="http://sctrading.blogspot.com/2008/03/opentick-python-api.html" rel="nofollow">http://sctrading.blogspot.com/2008/03/opentick-python-api.ht...</a>

Wow! Companies like Reuters charge $5000+ per month per seat for data like this! Not to mention that their data is pretty crappy. Too bad they don't have any FX data.

Unless I'm missing something, they currently aren't letting people create new accounts. So whatever free data they have (and they charge for most things, apparently) is unavailable for now anyway.

Should this be joining the entry at <a href="http://news.ycombinator.com/item?id=158998" rel="nofollow">http://news.ycombinator.com/item?id=158998</a> ?