Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Photoshop.com - Photoshop.
LightShot - The fastest way to take a customizable screenshot.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.