docopt : Command-line interface description language
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).
Phantomas : PhantomJS-based web performance metrics collector and monitoring tool
htty : htty is a console application for interacting with web servers. It’s a fun way to explore web APIs and to learn the ins and outs of HTTP.
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.