Best (free?) 'Web-Crawler' Software (to download copies of another site?)

OrangeOne

Legend
Problem: I want to download some copies of some sites, primarily some of my competitors' sites so that I can look back at a point in time and see who was doing what, when. It would also be nice to have offline-access to some sites for demonstrations, presentations, etc etc.

I know I can download or copy & paste pages here and there, but when I was at Uni there was talk about various 'web-crawler' software, that would download entire sites.

I don't mind if it's not called web-crawler S/W or not, hell I might have the completely wrong name for it.

But hopefully the above tells you what I'm looking for. If anyone could suggest some good options, hopefully free options, I'd be appreciative!
 
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