1. Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.

  2. Online Interpreters in JavaScript. Online coding and REPL. Run and share code.

  3. A front end web development playground.

  4. Plunker is an online community for creating, collaborating on and sharing your web development ideas.

  5. Sample of the bin:

  6. Pastebin.com is a website where you can store text for a certain period of time.

  7. HTML/CSS/JS and Markdown Code Playground For Web Designers and Developers

  8. Compileonline is now renamed to Coding Ground

  9. dabblet is an interactive playground for quickly testing snippets of CSS and HTML code.

  10. Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers

  11. Webmaker - teach your self to code for the web.

  12. Online playground for React