HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Nimbus Screenshot - Take screenshots and record video from your screen
ScrapBook - ScrapBook is a Firefox extension, which helps you to save Web pages and manage the collection.
ksnip - Ksnip is a Qt based cross-platform screenshot tool that provides many annotation features for your screenshots. - DamirPorobic/ksnip
Archivarix - Online website copier and Internet Archive downloader. Download all files from a website include scripts and images. Free CMS included! Clean and workable code of rebuilt sites, external links removing, Wordpress adaptation.
Evernote Web Clipper - Clip, don't bookmark. Web Clipper is a browser extension that lets you save any web page, article, or image into Evernote. Download now.