Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.

Raindrop.io - All your articles, photos, video & content from web & apps in one place.

Shutter - Shutter is a feature-rich screenshot program.

Tagpacker - A free tool to quickly collect, organize, and share your favorite links.

Snipping Tool - Use Snipping Tool to capture a screen shot, or snip, of any object on your screen, and then annotate, save, or share the image

LightShot - The fastest way to take a customizable screenshot.