Evernote Web Clipper - Clip, don't bookmark. Web Clipper is a browser extension that lets you save any web page, article, or image into Evernote. Download now.

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

CloudApp - CloudApp allows you to share images, links, music, videos and files. Here is how it works: choose a file, drag it to the menubar and let us take care of the rest.

Shutter - Shutter is a feature-rich screenshot program.

Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.

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