Scrimba - Interactive coding screencasts created in an instant
GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
Vidrio - Holographic screencasting app for Mac. Free for COVID-19
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
GoRails - Ruby on Rails screencasts for Web Developers
StackHive - Design, develop or publish websites right from your browser