fastpen is described as 'Fastpen is an open source alternative to codepen that just stores the source code compressed, in the url' and is a Code Editor in the development category. There are more than 25 alternatives to fastpen, not only websites but also apps for a variety of platforms, including Mac, Windows, Self-Hosted and Linux apps. The best fastpen alternative is Replit, which is free. Other great sites and apps similar to fastpen are CodePen, jsFiddle, JSPad and JS Bin.
Codewith.it is an online HTML, CSS and JavaScript code playground with realtime preview with many tools for developing web pages and advanced code analysis systems, with many assistance tools.
Storm is an online web development environment which allows users to run HTML, CSS, Javascript code in real time in a secured environment. It supports sharing Scribble (Storm project) via a dedicated link and also allows users to use jQuery and React framework of JavaScript.
JSitor is an online tool for testing and showcasing user-created and collaboration HTML, CSS, JavaScript and NodeJS snippets.
India
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Plunker is an online community for creating, collaborating on and sharing your web development ideas.
Flems is a playground for web development. It's ideal for prototyping ideas & sharing working front-end code examples.
Codiad is an open source, web-based, cloud IDE and code editor with minimal footprint and requirements
Compile and Execute your favorite programming languages online, click any of the following to proceed! Web Technologies, Text Formatting, Useful Utilities, Programming Languages. Vim, emacs modes are avaliable.
United Kingdom
Web Maker is an easy, quick and offline web experiment playground available as a Chrome extension, with open source code available at GitHub.
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