Paparazzi! - Paparazzi! is a small utility for Mac OS X that makes screenshots of webpages.
FireShot - Capture web page screenshots in Firefox, Chrome, or IE, and then edit and save them.
Awesome Screenshot - Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and...
iWeb2X - iWeb2x combines both iWeb2Print and iWeb2Shot. Convert web page to printer friendly PDF
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Snagit - Screen Capture Software for Windows and Mac