stylelint : A mighty, modern CSS linter that helps you enforce consistent conventions and avoid errors in your stylesheets.
Caire : Caire is a content aware image resize library
Sprite Cow : Sprite Cow helps you get the background-position, width and height of sprites within a spritesheet as a nice bit of copyable css.
* { CSS:resetr } : To help you find the perfect CSS-reset styles, CSSresetr lets you try all the best CSS Resets on a variety of web pages – even your own.
YAML Builder : A tool for visual layout development of YAML based CSS layouts
PurgeCSS is a tool to remove unused CSS. It can be part of your development workflow.
