What are some alternatives?
When comparing Wget and Offline Explorer, you can also consider the following products
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
aria2 - aria2 is a lightweight multi-protocol & multi-source command-line download utility. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.
ScrapBook - ScrapBook is a Firefox extension, which helps you to save Web pages and manage the collection.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
Teleport Pro - Teleport Pro is an all-purpose tool for getting data from the Internet.