Rapicorn version 8.4.0 is available for download at:

http://rapicorn.org/files/2008/

Rapicorn is an experimental UI toolkit.
It aims at bringing UI-design, UI-notation and UI-programming as close
together as possible. To accomplish this, it provides conscise ways for
UI notation, usable also throughout design phases.
Simple but powerful programming mechanisms will be provided to automate
binding of programming and GUI logic and to minimize manual work.

The project is hosted at:

http://rapicorn.org