PostCSS

Parse CSS and add vendor prefixes to rules by Can I Use

A CSS selector parser, integrates with postcss but does not require it.

PostCSS plugin for mixins

PostCSS plugin to inline @import rules content

CLI for postcss

Transforming styles with JS plugins

PostCSS plugin to replace easing names to cubic-bezier()

PostCSS loader for webpack

PostCSS plugin to add :focus selector to every :hover for keyboard accessibility

A BEM linter for postcss

PostCSS plugin to transform W3C CSS Custom Media Queries to more compatible CSS

PostCSS plugin to transform W3C CSS color function to more compatible CSS

PostCSS plugin to reduce calc()

PostCSS plugin to transform W3C CSS Custom Properties for cascading variables

PostCSS plugin to transform RGBA hexadecimal notations (#RRGGBBAA or #RGBA) to more compatible CSS (rgba())

PostCSS plugin to insert branding colors of all the major companies

PostCSS plugin to transform :not() W3C CSS level 4 pseudo class to more compatible CSS (multiple css3 :not() selectors)

PostCSS plugin to transform gray() to today's CSS

PostCSS plugin to transform :matches() W3C CSS pseudo class to more compatible CSS (simpler selectors)

Writing simple and graceful Media Queries!

PostCSS Custom Selectors

PostCSS plugin to transform W3C CSS hwb() function to more compatible CSS (rgb() or rgba()).

SCSS parser for PostCSS.

PostCSS for React Inline Styles, Free Style and other CSS-in-JS

Base tests for every PostCSS CSS parser

PostCSS Plugin Boilerplate

PostCSS plugin to rebase url(), inline or copy asset.

PostCSS plugin for Sass-like variables

Indent-based CSS syntax for PostCSS

PostCSS plugin to unwrap nested rules like how Sass does it.