LightShot

LightShot
Put the PrtScn (Print Screen) button to actual use. LightShot is a tiny utility that takes over that button. Push it and you can pick what part of the screen to turn into a screenshot, plus annotate with tools like text and arrows. It's also available for leading web browsers to capture what's on a page. Once captured, you get choices to save to a file, the clipboard, the cloud, social networks, or to just search for similar shots in Google.

Homepage: https://app.prntscr.com/en/download.html

Pixlr

Pixlr
Autodesk's Pixlr Editor does a great job of mimicking Photoshop—entirely in the web browser. Pixlr is a full ecosystem of apps, with different versions (like Editor and Express) suited to different needs. Or try the Pixlr-o-Matic Web- and mobile apps for simple, quick changes when you're in a hurry

Homepage: http://pixlr.com