Flameshot is a free and open-source cross-platform utility to take screenshots and make annotations.
Ranked in these QuestionsQuestion Ranking
Pro Edit and copy on the fly
Write texts, draw rectangles, circles, and arrows on a screenshot and copy all on the fly or save the edited picture to disk. You can change colors, sizes and widths of all the elements the tool provides.
Pro Upload to Imgur
Take a screenshot and upload to Imgur with a click.
Pro Pin tool
Pin screenshots on screen so that you won't have to scroll up and down to find something in a long document all the time.
Con No delay for area shot
It can not add a delay for an area shoot.