WebCopier!

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

ImpressPages is a PHP framework with admin panel. A new MVC engine is under the hood so you can customize ImpressPages in no time. Write your own plugins and themes to suit your and customers’ needs best. Both website layout and administration interface are user friendly and simply gorgeous.

UnMHT adds MHT file reading/writing support to Firefox.MHT (MHTML, RFC2557) is the webpage archive format to store HTML and images, CSS into single file.

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.

Teleport Pro is an all-purpose tool for getting data from the Internet. Launch up to ten simultaneous retrieval threads, access password-protected sites, filter files by size and type, search for keywords, and much more. Capable of reading HTML5, CSS3, and DHTML. With server-side image map exploration, automatic dial-up connecting, Java applet support, variable exploration depths, project scheduling, and relinking abilities.

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.

Darcy Ripper is a powerful pure Java multi-platform web crawlerwith great work load and speed capabilities. Darcy is a standalone multi-platform Graphical User Interface Application that can be used by simple users as well as programmers to download web related resources on the fly.

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.

WebZIP Offline Browser - a fast and easy way to download, store and browse Web sites offline.

Wysigot is far more than just a simple off-line browser!