ADR Tools : A command-line tool for working with Architecture Decision Records (ADRs).
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.
docopt : Command-line interface description language
gopass : gopass is a simple but powerful CLI password manager for your terminal with teams in mind.
Pro Git : The entire Pro Git book, written by Scott Chacon and published by Apress, is available here
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.