Web Dumper!

Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.

MetaProducts Offline Explorer is a Windows NT/2000/XP/2003/Vista program that allows you to download an unlimited number of your favorite Web and FTP sites for later offline viewing, editing or browsing.

PageArchiver (previously called "Scrapbook for SingleFile") is a Chrome extension that helps you to archive web pages for offline reading.

grab-site is a crawler for archiving websites to WARC files. It includes a dashboard for monitoring multiple crawls, and supports changing URL ignore patterns during the crawl.

SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet. It does this by asynchronously copying the sites Web pages, images, backgrounds, movies, and other files to your local hard drive.

Fresh WebSuction is designed for downloading Web pages or web contents (reference material, software files, online books, e-zines, news articles) for viewing offline, and saving money on Internet connection fees. If you pay fees for the amount of time you are online you can save money by quickly downloading all the Web sites you want to view and disconnecting.

Download entire websites to disk. Copy them to portable media, e.g. USB sticks. Create backup copies of websites, show websites to clients with no internet, download websites and browse them offline etc.