Archive.md - archive.is allows you to create a copy of a webpage that will always be up even if the original link is down
Estonian Web Archive - Estonian Web Archive is a digital archiving library working under the supervision of the National Library of Estonia.
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
Perma.cc - Perma.
Internet Memory Foundation - Internet Memory Foundation that is also known as Internet Memory only is a foundation dedicated to web archiving.
Archive-It - Archive-It is a free to use web archiving service designed for the libraries and archives.