If you find Quantblocks interesting, you should also look at Quantopian. (www.quantopian.com)

We're geared a bit more towards programmers. Rather than use blocks, our members develop their algorithms in Python. We have an in-browser IDE with a lot of smart auto-completion.

A few of our nifty features: * free access to 10 years of by-minute historical data for all US stocks * the writer of the algorithm owns the algorithm * batteries included - all of your favorite Python math and science packages including Pandas and NumPy * a robust backtester that models slippage, commissions, risk metrics, and more

We also have a community of quants and programmers who like talking about this kind of stuff. People share code, give advice, ask questions, etc.

Full disclosure: I work for Quantopian!

Happy hacking,

Dan Dunn