HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Web ScrapBook - A browser extension that captures the web page faithfully with highly customizable configurations.
ScrapBook - ScrapBook is a Firefox extension, which helps you to save Web pages and manage the collection.
wpull - Wpull is a wget-compatible web downloader and crawler with WARC and Python/Lua scripting support
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.
Offline Pages Pro - Offline Pages Pro is probably the world’s most advanced offline browser.