HTTrack is a free and easy-to-use offline browser utility. You can download the contents of entire web sites from the Internet to a local directory for offline viewing.

Simply open a page of the mirrored Web site in your browser and browse the site link by link as if you were viewing it online. HTTrack also can update existing mirrored sites and resume interrupted site downloads.

The program is fully configurable and includes an integrated help system. It crawls M3U and AAM files and can cache to a ZIP file. It also handles CSS.