I'd love for someone to explain about this "inferring causality from observational data". I've read a little before, and it sounded really exciting, but I wondered if it was just the same as instrumental variables with multiple instruments. Anyone know more?
There is also Tetrad. It's written in Java and has a GUI. <a href="https://github.com/cmu-phil/tetrad" rel="nofollow">https://github.com/cmu-phil/tetrad</a>