...Cirrus takes a generative approach to building your stylesheets. A large number of features with a minimal footprint. Fully responsive by design. Getting started with Cirrus is a few commands or lines of HTML away (depending on how you want to import it). The framework is designed to be pluggable into any new or existing projects.
Utk (Universal Toolkit) is a system written for Perl to provide transparency between toolkits. A program written with Utk can run in GNOME, KDE and HTML (pending Qt bindings) without recoding. Depends on plutils (http://sourceforge.net/projects/plutils)