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 Self-Hosted, Android, Mac and Windows 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.
HTCSJS is an online HTML, CSS and JavaScript coding tool. It functions on mobile (unlike JSFiddle), and allows any* external resources. It also allows pasting on iOS, unlike many others. http://shhnowisnottheti.me/demo/
*varies b/c it uses data URLs
Is your code your art? Be awarded a commission alongside some of the world's best interactive artists at the Barbican, London.
Web Maker is an easy, quick and offline web experiment playground available as a Chrome extension, with open source code available at GitHub.
A pastebin or text storage site is a type of online content hosting service where users can store plain text, e.g. to source code snippets for code review via Internet Relay Chat.
CodeBunk provides a Realtime Collaborative Editor with Compile/Run. CodeBunk is an Online Compiler/Interpreter for PHP, Python, Ruby, Perl, Lua, Javascript, C, C++. CodeBunk also has Peer-to-Peer Video/Audio chat facility.
Make Awesome Web Things, Demos, Apps with html, css, javascript in online code editor.
A collaborative online web development platform using HTML, CSS and JavaScript with a focus on design systems and financial applications.
Aaditor is World's first HTML editor with drag layout. Aaditor has a function of full screen result. You can change the layout of Aaditor according to your wish. All the html,css and js boxes of Aaditor can be dragged , resized and minimized .
Test HTML / JavaScript / CSS snippets with real-time preview. You could also add libraries (jQuery, YUI etc.).
Codeply is a editor that lets you run and preview your HTML, CSS and JavaScript code from any modern Web-browser. You've seen this capability in other tools like JSFiddle, Codepen and Bootply. But, Codeply is different because it's not just a code editor.
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