TLDR pages - The TLDR pages are a community effort to simplify the beloved man pages with practical examples.
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
bropages - bro pages are concise examples of using command line programs
explainshell - Match command-line arguments to their help.
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation
CheatSheet - View Mac keyboard shortcuts in the current application