A better indication of what to go for may be looking at the testable packages which depend on Gtk, Tk & etc.
A lot of good work is put into Gtk, but the hours we spend on resolving issues (on Windows and OsX) are not so interesting. I think Gtk needs a base of users who at least reports issues (I have had some instances with crashes which were difficult to pinpoint and resolve, and so gave up without contributing with error reports. Bad behaviour. ). But the buck don't always stop within the Julia community. Gtk is used to its max in the image manipulator Gimp (I assume), but even there the windows managing is sub par in my personal windowized opinion. Blink also has dependencies, but with Chrom(ium?). That's extremely well developed software with pretty limitless possibilities - especially if you know the technologies already. https://www.youtube.com/watch?v=IqNUcXmbWWY&index=8&list=PLP8iPy9hna6Sdx4soiGrSefrmOPdUWixM GLVisualize still has few users, but it's maturing fast and can potentially go very very far.
