Always wanted to trade a hedge fund but never had the capital, the guts or the smarts to test drive your ideas? Don’t worry. Quantopian (www.quantopian.com), a Boston-based startup, has got your back. Quantopian’s assembling a community of would-be hedgies who build stock trading algorithms, hundreds of which are available for free on the company’s website.  

You can borrow an algo or build own of your own.

Quantopian's online technology includes a backtest function that allows you to see how your algo would have worked in the past as well as a dry run feature that allows you to run your trading program in real time with live stock data.