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
Swagger : Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs...
gopass : gopass is a simple but powerful CLI password manager for your terminal with teams in mind.
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.