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Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Lightbeam for Firefox - Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
island - a free and opensource alternative to parellel space
LightShot - The fastest way to take a customizable screenshot.
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.