CSS Sprite Generator : This tool allows you to automate the process of generating CSS sprites. Simply give it a ZIP file containing 2 or more images (GIF, PNG or JPG) and it...
📦 Parcel : Blazing fast, zero configuration web application bundler
csscss : csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.
Sizzy : A tool for developing responsive websites crazy-fast.
Open sourced : https://github.com/kitze/sizzy
PurgeCSS : PurgeCSS is a tool to remove unused CSS. It can be part of your development workflow.
UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS.