docopt : Command-line interface description language
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.
howdoi : Instant coding answers via the command line.
explainshell.com : write down a command-line to see the help text that matches each argument
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.