SeaMonkey is a high-level UI toolkit for Seaside that provides a set of reusable user interface components similar to Mac OS X's Cocoa or Java swing. It allows to specify different CSS classes for each component instance so that you have detailed control about the exact presentation of each component in your website. Please use a mechanism such as KVBindings to react on changes in a component model. (Actually, you need the KVBinding package to run the test component.) This project is still in very alpha state.