About gnome-shell-extensions
GNOME Shell Extensions is a collection of extensions providing
additional and optional functionality to GNOME Shell. Most extensions
can be installed by configuring --prefix=$HOME/.local, and will be
picked automatically at next login.
About GNOME Shell
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GNOME Shell provides core user interface functions for the GNOME 3
desktop, like switching to windows and launching applications. GNOME
Shell takes advantage of the capabilities of modern graphics hardware
and introduces innovative user interface concepts to
About mutter
Mutter is a window and compositing manager that displays and manages
your desktop via OpenGL. Mutter combines a sophisticated display
engine using the Clutter toolkit with solid window-management logic
inherited from the Metacity window manager.
While Mutter can be used
gscan2pdf - A GUI to produce a multipage PDF or DjVu from a scan.
http://gscan2pdf.sourceforge.net/
Five clicks are required to scan several pages and then save all or
a selection as a PDF or DjVu file, including metadata if required.
gscan2pdf can control regular or sheet-fed (ADF) scanners
