Bundling in major distros? (Say, Debian, Ubuntu, Fedora, SUSE(?)) GTK being open-source and quickly adopted by several popular projects? Being initially under t

Bundling in major distros? (Say, Debian, Ubuntu, Fedora, SUSE(?)) GTK being open-source and quickly adopted by several popular projects? Being initially under the GNU Project? Probably a lot of factors adding together. KDE is pretty great, though.