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cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
TLDR pages - The TLDR pages are a community effort to simplify the beloved man pages with practical examples.
Devhints - TL;DR for developer documentation
explainshell - Match command-line arguments to their help.
OpenGraph.xyz - Check how search engines and social medias such as Google, Facebook, Twitter display your website