Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.

CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.

Anchor CMS - Free and lightweight blogging system

GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.

Textpattern - Textpattern is an elegant content management system that is free, open source software.

CodeTasty - CodeTasty is a programming platform for developers in the cloud.