Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Screenzy - A simple screenshot beautifier
LightShot - The fastest way to take a customizable screenshot.
Screely - Screely instantly generates dribbble-ready images. Simply upload your screenshot and we'll do the rest.
Snagit - Screen Capture Software for Windows and Mac
Setapp - Your shortcut to prime apps on Mac, an App Store alternative