PostCSS

Software development tool that uses JavaScript-based plugins to automate routine CSS operations. PostCSS and its plugins are written in Node.js, so they can be managed with npm.

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First released 2013
Developed by Andrey Sitnik, Ben Briggs, Bogdan Chadkin
Latest stable version 6.0.2
Open-source Yes
Used by Facebook, Github, Google, WordPress

Interesting facts

PostCSS aims to reinvent CSS with an ecosystem of custom plugins and tools.

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Development by Synergize.digital