Inspired by OOCSS and SASS; xCSS is PHP based CSS framework that allows you to work object-oriented and keeps your workflow as “DRY” as possible. xCSS is lightweight and seamlessly integrates into any existing workflow; key features include using variables, nesting child objects, extending objects and comments.
xCSS requires PHP5 and is fairly easy to install and configure.It is most suitable for you if you are comfortable with object oriented programming and need to develop complex style structures.
Developed by Anton Pawlik; xCSS is available for download under MIT License. You can find further information, demo & download on xCSS Website.