https://autoprefixer.github.io

Autoprefixer is a PostCSS plugin which parse your CSS and add vendor prefixes

https://autoprefixer.github.io

https://www.cleancss.com/

 Clean CSS is now available for more than just CSS. You can now beautify, minify, format, or compress many different file formats. Choose the tool below to get started.

http://css3generator.com/

CSS3 Generator

http://border-radius.com/

CSS Border Radius Generator

https://www.cleancss.com/html-beautify/

https://www.cleancss.com/html-beautify/

http://www.cssmatic.com/box-shadow

http://netpresent.net/css-inverter.php

CSS Color Inverter

Invert all numbered colors in a CSS stylesheet

http://netpresent.net/css-inverter.php