Ranked in these QuestionsQuestion Ranking
Takes only 6MB memory to install and leaves small footprint on system.
Pro Simple and sober GUI
Doesn't contain too many options in GUI which can confuse beginners.
Pro Takes screenshots with keyboard shortcuts
Grabbing screenshots is too easy with it's shortcuts-
Prnt screen key to take a screenshot of desktop
Alt+prnt screen keys to take a screenshot of a window
Shift+prnt screen keys to take a screenshot of an area you select
Ctrl key for copying the screenshot image into clipboard
Pro Default screenshot program in many distros
Debian, MXLinux, Ubuntu and many other distros use it as their default screenshot program.