You should understand that the Gimp and Gtk weren’t written to fill holes in the software available under the GPL (GNU General Public License) and LGPL (GNU Library General Public License). The Gimp was started because I wanted to make a Web page. Gtk was started because I was dissatisfied with Motif and wanted to see what it took to write a UI toolkit. These are purely selfish reasons. That is probably why the projects progressed so far and eventually succeeded. I find it much more difficult to work on something for extended periods of time for selfless reasons.