ADR Tools : A command-line tool for working with Architecture Decision Records (ADRs).
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.
Caire : Caire is a content aware image resize library
HTTPie : HTTPie—aitch-tee-tee-pie—is a command line HTTP client with an intuitive UI, JSON support, syntax highlighting, wget-like downloads, plugins, and more
The TLDR pages are a community effort to simplify the beloved man pages with practical examples.