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by junkbit 5607 days ago
The release announcement says that Gtk3 has switched to Cairo to draw the toolkit behind the scenes:

Cairo drawing throughout. GDK no longer wraps the antiquated X11 drawing API; we've made a clean break and exclusively rely on cairo for all our drawing needs now.

As for Clutter, the OpenGL based canvas, Gnome-Shell (aka the Gnome 3 desktop UI) uses cluttter throughout. The new window manager is called Mutter which is a fork of Metacity to use Clutter for hardware acceleration and all the panels and other desktop UI are also rendered this way.