Of course, Non-GNU projects that are licensed in such a way that they could be GNU projects.
From the registration page, the kind of software project that can be hosted on Savannah is [a] free software package that can run on a completely free operating system, without depending on any nonfree software. You can only provide versions for nonfree operating systems if you also provide free operating systems versions with the same or more functionalities. Large software distributions are not allowed; they should be split into separate projects.