Best Offline Browser / WebSite Downloader Client

SpiderZilla is intended to be a Firefox and Mozilla Suite extension for offline browsing. Basically, it is only a front-end for the opensource command line program HTTrack.

HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility. It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer.

It is a free, powerful offline browser. A high-speed, multi-threading website download and viewing program. By making multiple simultaneous server requests, BackStreet Browser can quickly download entire website or part of a site including HTML, graphics, Java Applets, sound and other user definable files, and saves all the files in your hard drive, either in their native format, or as a compressed ZIP file and view offline.

SurfOffline is a fast and convenient website download software. The software allows you to download entire websites and download web pages to your local hard drive. 30-day trial period.

ScrapBook is a Firefox extension, which helps you to save Web snippets, pages, or entire sites and easily manage collections.