Plunker

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

14 Alternatives To Plunker

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CodePen

A front end web development playground.

CodeSandbox

Online playground for React

Codeanywhere

Codeanywhere is a complete toolset for web development. Enabling you to edit, collaborate and run your projects from any device.

Codeply

Responsive Design Playground & Frontend Editor. Use, compare & test responsive frameworks. Find code snippets & examples.
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Codiad

Codiad is an open source, web-based, cloud IDE and code editor with minimal footprint and requirements

Firefox Developer Tools

Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
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Glitch

Glitch is the friendly community where everyone builds the web. Simple, powerful interface for creating web apps.

HTMLPen

HTMLPen is a free online Visual HTML Editor (WYSIWYG Editor) program allows you visually edit, preview, and run your html code. It is also a powerful online text editor.
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JSitor

Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.

Koding

Koding lets your organization create and share fully automated dev environments on any infrastructure for modern distributed applications, micro-services and containers. Koding provides an interface for developers and team managers to streamline dev workflows in the cloud without slowing down freedom and creativity.
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ShiftEdit

ShiftEdit is a free web based IDE.

StackBlitz

Online VS Code Editor for Angular and React

codebunk

Realtime Collaborative Editor with Code Execution, REPLs and Chat