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

Trilium Notes - Trilium Notes is a hierarchical note taking application.

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

Learn Swift - Screencasts & code examples to learn Apple’s new Swift

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

Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.