GitHub Codespaces - GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
TLDR pages - The TLDR pages are a community effort to simplify the beloved man pages with practical examples.
CloudShell - Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
CheatKeys - View Windows keyboard shortcuts in the current application.
CodeTasty - CodeTasty is a programming platform for developers in the cloud.
explainshell - Match command-line arguments to their help.