Wget

From KevinWiki

Download File

-To download a file from the web site secured by SSL and requires username and password.

wget --no-check-certificate --http-user=<username> --http-password=<password> https://site.url.com ~/<location to save>

-To download an entire website

wget --wait=20 --limit-rate=20K -r -p -U Mozilla http://www.somesite.com 

--wait=20: 20 seconds between retrievals.
--limit-rate=20K: limit download rate to 20KBps (=20: 20Bps / =20K: 20KBps)
-r: download recursively
-p: --page-requisites get all images, etc. needed to display HTML page
-U: set user-agent (e.g. -U Mozilla: user-agent is Mozilla)

References

http://linuxreviews.org/quicktips/wget/