Homepage of Arav Agarwal
Here are the sites:
Coursera
FreeCodeCamp
Udacity
Codeacademy
Curious
Zooniverse
EdX
FutureLearn
Stanford-Online
MIT Open Courseware
Harvard Open Learning
Code4Startup
Degreed
Curiosity
Caltech Machine Learning
Floating University
Duolingo
OpenCulture
Khan Academy
Chesscademy
Lingvist
Open University
Open Yale Courses
Gresham College
Saylor Foundation
Highbrow
Lynda
Code School
Checkio