how2 : stackoverflow from the terminal.
how2 finds the simplest way to do something in a unix shell. It's like man, but you can query it in natural language.
ADR Tools : A command-line tool for working with Architecture Decision Records (ADRs).
docopt : Command-line interface description language
MkDocs : MkDocs is a fast, simple and downright gorgeous static site generator that's geared towards building project documentation. Documentation source files...
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.