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
The CMS Matrix : CMSmatrix lets you easily compare the features in over 1200 content management system products. Check the boxes next to the software you're interested...
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.