Resurrect Pages - Dead pages, broken links, the scourge of the internet.
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
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
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.
Perma.cc - Perma.
oldweb.today - Time travel across the world wide web using old browsers