- Guide to Unix - wikibook
- Filesystem Hierarchy Standard (FHS) - linux foundation
- POSIX.1-2024
- List of GNU Packages - wikipedia
- Command Shell
- Text Editor
- Vim
- A Byte of Vim
- Cheat Sheets
- Use Vim Like A Pro - tim ottinger (cc by 3.0)
- Vi Editor - ss64.com
- VimGolf - real ninjas count every keystroke
- Vi Quick Reference
- Vim Help Files - html version of the vim help pages
- Vim Regular Expressions
- Vim Regular Expressions 101
- Nano
- Vim
- Guide to X11 - wikibook
- Documentation for X11R7.7 - x.org
- X Window System Protocol - x.org
- Explanation - Play, don't show (windowing techniques)
- FVWM Beginner's Guide - skriletz