Default GNOME applications.

GNOME is the default desktop environment that comes with Ubuntu.
It has a set of pre-installed software, most of which use an alias when presented in the launcher or the GUI.
The following list presents their actual names and are used to run them from the terminal.

evince document viewer
eog image viewer (Eye of GNOME)
nautilus file manager

GNOME comes with a tool to take screenshots.

PrtSc Save a screenshot of the entire screen to the “Pictures” directory.
Shift+PrtSc Save a screenshot of a specific region to Pictures.
Shift+Ctrl+PrtSc Copy the screenshot of a specific region to the clipboard.

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