cssed

cssed is a small developer editor and validator, that tries to ease the CSS editing. It is an Open Source project, it means that you can download the program but also its source.

Being a CSS editor, it's not limited to this language. cssed haved some support for HTML (with embbeded Javascript), XML, Javascript, Java, PHP, JSP, C, C , Apache configuration files, .htaccess, Python, Perl, SQL, SH and other languages so it can serve quite well as multi-purpose editor.