The Xfce4-screenshooter is an application that can be used to take snapshots of your desktop screen.
Gnome Screenshot
GNOME Screenshot yog ib lub chaw tso dej me me uas yuav siv sij hawm ib screenshot ntawm tus kheej
desktop; the currently focused window; or an area of the screen.
KSnip
Ksnip is a Qt based cross-platform screenshot tool that provides many annotation features for your screenshots.
taws
Powerful yet simple to use screenshot software.