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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
Cached View - CachedView claimed to be the provider of Google caches pages of any website at the moment listed in the index of the Google search engine.
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
Archive-It - Archive-It is a free to use web archiving service designed for the libraries and archives.
Perma.cc - Perma.
TheOldNet - The Old Net is an attempt to restore vintage web browsing on vintage computers. It uses the Internet Archive: Wayback Machine API and a proxy that strips out any incompatible javascript and stitches together as many links as it can.