Project Wallace is a set of CSS analyzers that check your complexity, specificity, performance, Design Tokens and much more. And all of that in a single web app.

Paged.js is a free and open-source library that paginates any HTML content to produce beautiful print-ready PDF. The library fragments the content, reads your CSS print declarations and presents a paginated preview in your browser that you can save as PDF.

Koala is a GUI application for Less, Sass, Compass and CoffeeScript compilation, to help web developers to use them more efficiently. Koala can run in windows, linux and mac.