- Open Math Notes
- A repository of freely downloadable mathematical works hosted by the American Mathematical Society
- The Art of Command Line
- A selection of notes and tips on using the Bash command line
- Markdown Guide
- Reference guide with get started, cheet sheet, basic syntax, extended syntax, etc.
- A Visual Git Reference
- A guide for basic usage of Git illustrated with many diagrams
- Graphical Vim Cheat Sheet and Tutorial
- Cheat sheet lessons about Vim in GIF and PDF formats
- Arch Manual Pages
- Repository of all manual pages available in the Arch Linux packages
- AltTab
- AltTab brings the power of Linux “alt-tab” window switcher to macOS