HTTrack
Open Source
HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
WebCopy
Free
WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Teleport Pro
Commercial
Teleport Pro is an offline browsing webspider.
ScrapBook
Open Source
ScrapBook is an extension for the Mozilla Firefox web browser which adds enhanced scrapbooking, page saving, bookmarking, and notetaking functionality.
UnMHT
Open Source
UnMHT adds MHT file reading/writing support to Firefox and SeaMonkey.
SiteSucker
Commercial
SiteSucker helps you download websites to your computer.
Compare Offline Explorer with alternatives
Compare HTTrack and Offline Explorer and decide which is most suitable for you.
Compare ScrapBook and Offline Explorer and decide which is most suitable for you.
Compare WebCopy and Offline Explorer and decide which is most suitable for you.
Compare UnMHT and Offline Explorer and decide which is most suitable for you.
Compare Teleport Pro and Offline Explorer and decide which is most suitable for you.
Compare SiteSucker and Offline Explorer and decide which is most suitable for you.