There used to be a task list for the GNU project if I'm not mistaken. The general list of ways to help GNU is http://www.gnu.org/help/help.html.
The technical task list has been maintained through savannah for some years. https://savannah.gnu.org/people/ seems to have evolved into a multitude of task lists and a priority list for projects. There was always a "multitude" of lists. There are actually fewer now (two, essentially) than in the past. karl
