clutter: clutter (GUI Library) clutter: clutter: Clutter is an open source software library for creating fast, clutter: compelling, portable, and dynamic graphical user interfaces. clutter: clutter: Clutter uses OpenGL for rendering, but wraps an easy to use, clutter: efficient, flexible API around GL complexity. clutter: clutter: clutter: Project URL: https://github.com/GNOME/clutter clutter: