Gitstalk - Discover what your favorite GitHub users are up to
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
cheat.sh - The only cheat sheet you need Unified access to the best community driven documentation
CodeMyUI - Handpicked code snippets you can use in your web projects
explainshell - Match command-line arguments to their help.