What are some alternatives?
When comparing Codelearn and CodeAvengers, you can also consider the following products
Codecademy - Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
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.
Famo.us University - Famo.us University includes live coding lessons, tutorials, and discrete examples tied to our...
SoloLearn - Learning has never been this social and accessible for so many!
Code.org - Code.org is a non-profit whose goal is to expose all students to computer programming.
Google's Python Class - Assorted educational materials provided by Google.