The E*TRADE PHP SDK is available to download from the developer platform site. Beginners and advanced developers could build their own trading application to analyze market data in real time. Resources include documentation, code examples, and developer support.
The internet is the perfect medium for matching supply with demand. You can find your next freelance job or, as Craigslist has been singled out for, find just about anything else (if you know the right euphemisms). Now, with Data Marketplace, you can request or provide datasets covering anything you can think of.