The GNU Ada Translator (GNAT) isn't available for the Hurd so far. There are also a number of other Debian packages depending on GNAT, and thus not buildable on the Hurd.
The goal of this project is getting GNAT fully working in Debian GNU/Hurd. It requires implementing some explicitely system-specific stuff in GNAT, and maybe fixing a few other problems. Good knowledge of Ada is a must; some Hurd knowledge will have to be aquired while working on the project.
Possible mentors: Samuel Thibault (youpi)
Exercise: Fix one of the problems preventing GNAT from working on the Hurd.