Recommended sites for Online Education

Question

1. Coursera
Provide Online Courses covering dozens of different subjects.

2. Lynda.com
Access to more than 80,000 videos on a broad range of different subjects.

3. Udemy
800 new courses every month. Ranging from $10 - $500 for different courses.

4. Udacity
platform with a strong focus on technology such as data science and client such as Sales force and Facebook.

5.Khan Academy
non-profit online platform providing a complete free library of educational courses.

Feel free to contribute more

Answer 1

CodingBat, http://codingbat.com
has problem sets in Python and Java with automated tests to check your attempts against multiple inputs. The site is run by Nick Parlante, a CS lecturer at Stanford University.

Another site to practise your skills is CodeAbbey, http://www.codeabbey.com/, run by Rodion Gorkovenko.

Both don't have a lot of gamification, but at the end of the day, badges don't mean a lot, while knowledge does.

The online learning branch of the Hasso-Plattner Insitute, https://open.hpi.de, offers a lot of courses with multiple choice tests, programming exercises, etc.
Note that most courses are in German, but once in a while, you'll find courses in English too.

Answer 2

https://code.sololearn.com/WLERR0KIgB86/?ref=app

Answer 3

edX - similar to coursera (free course, paid certificate )

free courses at the open university - http://www.open.edu/openlearn/free-courses/full-catalogue

Answer 4

FreeCodeCamp - https://www.freecodecamp.com/
An open source community that helps you learn to code

Answer 5

Freecodecamp and codeacademy are also a good free sources.