CSS-Tricks - CSS-Tricks is a website about websites.
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
The Little Book on CoffeeScript - "The Little Book on CoffeeScript" is a short (62 page) book that shows developers how to build web applications with CoffeeScript.
Tailwind CSS Play - An advanced online playground for Tailwind CSS
Flexbox Froggy - A game for learning CSS flexbox
ZappJS - code generator for Node.js, Ruby, Swift, Java, PHP & more