CrossBrowserTesting - Browser Testing made simple! Run automated, visual, and manual tests on 1500+ real browsers and mobile devices. Test more browsers, in less time.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
LightShot - The fastest way to take a customizable screenshot.
browserling - Live interactive cross-browser testing from your browser.
Snagit - Screen Capture Software for Windows and Mac