CSSTidy
CSSTidy is an open source parser and optimizer for Cascading Style Sheets, which was written by Florian Schmitz. Versions are available in C and PHP. The name is derived from HTML Tidy as CSSTidy seeks the goal of HTML to be the CSS Tidy counterpart. Currently CSSTidy has the ability to correct some common errors ( such as missing units or semicolons ) and the CSS code reformat and compress.
The current version of CSSTidy is 1.3. This is according to the creator, the last version - the project was dropped and the creator seeks a new maintenance engineer for the project.
However, the PHP version also contains bug fixes and improved unit testing.