Expressive, robust, feature-rich CSS language built for Node.js
Stylus is a dynamic stylesheet language that is compiled into Cascading Style Sheets (CSS). Its design is influenced by Sass and LESS. It's regarded as the third most used CSS preprocessor syntax. It was created by TJ Holowaychuk, a former programmer for Node.js and the creator of the Luna language. It is written in JADE and Node.js.
It plays a role similar to SASS and LESS, but strives for a cleaner syntax and more powerful features.
See the Stylus homepage for details.