An “unofficial community-maintained fork of historical GTK2” has been started, and is hosted over at the Devuan project. It is, essentially, GTK2… with a few key updates to allow it to build on modern systems. The core benefit here would be in being able to continue building and supporting GTK2 software (which there is a LOT of), running on X11, on modern systems. No Wayland. None of the GTK3+ bloat. In fact, multiple people are already talking about using this to fork and build pre-GTK3 versions of GTK based Desktop Environments (such as MATE/GNOME and XFCE). The developer makes a point of saying that this is “Not affiliated with GTK or GNOME” and is still searching for the right name. “Good Tool Kit” appears to be the leading suggestion. At the moment it is simply “GTK2-NG”.