GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
JSitor - Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.
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:
CodeTasty - CodeTasty is a programming platform for developers in the cloud.
CodePen - A front end web development playground.