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

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

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

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

  7. Realtime Collaborative Editor with Code Execution, REPLs and Chat

  8. Gist is a simple way to share snippets and pastes with others.