MOOC. Massive Open Online Courses

Coursera. The world’s best courses, online, for free.
Edx. Take great courses from the world’s best universities.
Udacity. Learn, Think, Do.
Udemy. Online courses. Anytime, anywhere.

Programación

CodeSchool
CodeAcademy
TeamTreeHouse
LearnStreet
NodeSchool: Aprende Node.js siguiendo esta interesante web.