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CodeSandbox - Online playground for React
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
CodePen - A front end web development playground.
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
JS Bin - Sample of the bin:
StackHive - Design, develop or publish websites right from your browser