ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Save Page WE - Download Save Page WE for Firefox. Save a complete web page (as curently displayed) as a single HTML file that can be opened in any browser. Choose which items to save. Define the format of the saved filename. Enter user comments.
Awesome Screenshot - Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and...
BrowseShot - BrowseShot lets you capture a PNG of the full scrollable area of a website.
SingleFile - Save a complete page into a single HTML file
Paparazzi! - Paparazzi! is a small utility for Mac OS X that makes screenshots of webpages.