Diigo Web Collector - Bookmark, Archive, Screenshot & Markup - All-In-One Web Collector, must-have research tool
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Onenote Web Clipper - Quickly capture any webpage to OneNote where you can easily edit, annotate, or share it. Clip the full page, or clip only the article, recipe, or product information you really need.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Pocket - When you find something you want to view later, put it in Pocket.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.