HTTrack is a free (open source) and easy-to-use offline browser utility.
Download a World Wide Web site from the Internet to a local directory.
Builds recursively all directories.
Getting HTML, images, and other files from the server.
HTTrack arranges the original site's relative link-structure.
Simply open a page of the "mirrored" website in your browser.
You can browse the site from link to link, as if you were viewing it online.
It can update an existing mirrored site, and resume interrupted downloads.
It is fully configurable, and has an integrated help system.