Gwydion Dylan is a portable, optimizing DylanLanguage<tm> compiler. It was originally written by the Gwydion Group at CMU and is now maintained by volunteers. Eventually, we'd like Gwydion Dylan to become a top-notch tool for building complicated applications written in a mix of Dylan and C.
The home page of the Gwydion Dylan project is http://www.gwydiondylan.org.