Hackr.io - There are tons of online programming courses and tutorials, but it's never easy to find the best one. Try Hackr.io to find the best online courses submitted & voted by the programming community.
MarkSheet - Browser-based guide and tutorial for HTML and CSS tutorial
Google's Python Class - Assorted educational materials provided by Google.
CoffeeScript Ristretto - "Beliefs that are incompatible with human dignity and the fundamental rights of others are not worthy of respect in a democratic society."
A Byte of Python - A Byte of Python is a Python programming tutorial and learning book that teaches you how to program with the Python programming language.
CSS-Tricks - CSS-Tricks is a website about websites.