Metallic look to HML elements.

Source code: https://github.com/MikaeI/metallicss (available as npm package)

Generate animations with the mouse :D

Github: https://github.com/panphora/animatize

A bootstrap similar library

Copy/Paste the most used media query

Manual-writing styled forms with a CSS only file.

The font Short Stack should also be used. It is available as NPM package.

Another drop-in css stylesheet which make a website beautiful :)

Demo: https://alvaromontoro.github.io/almond.css/demo/

Using CSS to get a fingerprint of the browser. Here is a all-in-one resource.

#BADA55, #101 (lol), #C55 (CSS), #fb1 (FBI), etc...

It uses the l33t code for that.

It generates different layouts

Another collection of CSS loaders and spinners

Another list of CSS spinners

Customizable CSS loaders and spinners

Another background css pattern generator

Another one: https://patternizer.com/4rvv

Build semi-transparent, blurred glass-like backgrounds.