This is very specific to data science for now, but I'm working on Dataquest (https://www.dataquest.io https://www.dataquest.io), which has interactive explanati

This is very specific to data science for now, but I'm working on Dataquest (https://www.dataquest.io https://www.dataquest.io), which has interactive explanations and diagrams. It's almost entirely reading theory and explanations + writing code. It's hard to get broad coverage like udemy/coursera, but it's a problem we'd love to work on in the future. I've liked scotch.io for some dev things, and thinkster.io for some Angular/frontend. Also check out these IPython notebooks for a ton of topics: https://github.com/ipython/ipython/wiki/A-gallery-of-interesting-IPython-Notebooks https://github.com/ipython/ipython/wiki/A-gallery-of-interes... .