
jsdo.it is a coding community for front-end engineers such as web designers, mark-up engineers, and JavaScript engineers. This is an online editor where you can try running your codes as you write. You can save your codes online as well as show them to the public as your work. Don’t worry even if you are not confident in your skill! Arrange shared codes and learn cutting-edge techniques.

codepad is an online compiler/interpreter, and a collaboration tool.

Dirty Markup is a free web-based application for cleaning up such code very easily. It has support for HTML(5), CSS and JavaScript by combining the powers of the popular HTML Tidy, CSS Tidy and JS Beautify. The editor used is the + functional AceEditor and there are multiple options for each beautifier to get the best result.

RegExr is an online tool for editing and testing Regular Expressions (RegExp / RegEx). It provides a intece to enter RegEx expressions, and visualize matches in real-time editable source text. It also provides a handy RegExp snippet sidebar with descriptions and usage examples to make it easier to learn Regular Expressions through trial and error.
RegExr is built with Flex 3, and uses ActionScript 3′s built in RegExp engine. It isn’t as powerful as a product like RegExBuddy, but it has the advantage of being online and free. You are able to save your patterns locally, and to share patterns on a searchable community database of regular expressions as well.

Ideone is an online compiler and debugging tool which allows you to compile source code and execute it online in more than 60 programming language
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