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
Resurrect Pages - Dead pages, broken links, the scourge of the internet.
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
Archive.st - Free web page archiving service
oldweb.today - Time travel across the world wide web using old browsers
Time Travel - Prebook rides for Uber