Coursera

Category: 
Description: 
Coursera is a set of on-line courses given by the best universities in the world. All courses are free but sometimes you may pay a small amount for course finishing certificate. Courses are grouped in categories depending area of knowledge. Courses starting at defined dates.
Cost: 
Free, sometimes you may pay for getting a certificate
How to use it: 
Just login to the page and sign-up for courses