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jsFiddle is a free code-sharing tool that allows you to edit, share, execute and debug Web code within a browser.

CodePen – Online Python – IDE, Editor, Compiler, Interpreter.

JSFiddle is more about sharing problems, asking questions or posting solutions to issues (users on StackOverflow pretty much use JSFiddle to share code exclusively), while CodePen is for sharing eye-candy stuff – snippets, UI patterns and such.

CodePen is a great place to learn and work on coding web-based and front-end projects . The challenges are fun and engaging and the community is very supportive. CodePen is an excellent web-based IDE for web and front-end development. The site supports HTML, CSS, JavaScript and more.