BrowserStack - BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality.
Paparazzi! - Paparazzi! is a small utility for Mac OS X that makes screenshots of webpages.
browserling - Live interactive cross-browser testing from your browser.
Awesome Screenshot - Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and...
Browsershots - Browsershots makes screenshots of your web design in different browsers.
web-capture - Capture a full web page screenshot online