JSitor - Test your NodeJS, JavaScript, CSS, HTML online with JSitor code editor.
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
Spck Editor - A full-fledged, embeddable, online editor for private, offline web projects.
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
Website Starter Kit from Glitch - Learn HTML, JS, CSS & Node.js w/ free videos & live code
StackHive - Design, develop or publish websites right from your browser