WTF : WTF is a personal information dashboard for your terminal, developed for those who spend most of their day in the command line.
It allows you to monit...
UnCSS : UnCSS is a tool that removes unused CSS from your stylesheets. It works across multiple files and supports Javascript-injected CSS.
ADR Tools : A command-line tool for working with Architecture Decision Records (ADRs).
YAML Builder : A tool for visual layout development of YAML based CSS layouts
Sizzy : A tool for developing responsive websites crazy-fast.
Open sourced : https://github.com/kitze/sizzy
PurgeCSS is a tool to remove unused CSS. It can be part of your development workflow.