CodePen: free online editor for JavaScript, CSS and HTML

CodePen is a great tool for web developers that makes it possible to program in different languages directly in the browser without installing any application on your computer. Its use is free, also offers a full retail version, and supports HTML code, Javascript and CSS.

CodePen is a free online editor for JavaScript, CSS and HTML

Another advantage of the CodePen online editor is it has quite a social function, a feature that allows us to share source code (if we wish), learning by observing shared by other users and interact with other developers code. It is also possible to embed code snippets in blogs and pages, use it as a portfolio for projects, etc..

A page that should be present in your list of favorites, if you do web development, especially interesting for all kinds of projects, share experiences and of course to program in any of the supported languages.