Snagit
Snagit is a screen capture tool that provides an easy way to capture, edit, and share screenshots, images, and video. You can then paste the screenshot into any document, share it on Twitter, take a screenshot of a video to share it on Facebook, or upload it to its own Snagit.com account.
Skitch
Skitch lets you annotate and share your screenshots with others. You can take a screenshot from your computer, webcam, or a mobile device and use Skitch to add shapes, arrows, text, and more to them.
Screenshot
Screenshot is a free tool that makes it easy to take a screenshot or screencast of whatever is on your screen. It’s the perfect way to save a web page, add a comment to a blog, add a bug report to a ticket, or share your iOS device's screen.
Jing
Jing is a free screen capture and video capture software from TechSmith. It allows you to record the entire screen, a single window, or a selected region, and then edit your recording before saving it. You can choose to include audio, show the cursor, or make the mouse pointer visible.
FastStone Capture
FastStone Capture is a free, fast, and easy-to-use screen capturing tool. It has a nice, clean interface that lets you capture anything on your screen or import an image file. You can also add text, arrows, shapes, and lines that will show up on the screenshot.
Cloudshots
Cloudshots is a screenshot application for PC, Mac, and Linux. Cloudshots is compatible with most web browsers, and is available in the Chrome Store.