Pocket - When you find something you want to view later, put it in Pocket.
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.
Snagit - Screen Capture Software for Windows and Mac
Instapaper - Instapaper is a simple tool to save web pages for reading later.
MWSnap - MWSnap is basically a free to use Windows snapping tools that are used for snapping any part of the screen that is currently displaying on the front of all opened programs and windows.