Archive.is
is a website that allows you to archive a snapshot of you websites that will always remains online evenif the original page disappears.
BlackWidow
softbytelabs.com
CashedPages
www.cachedpages.com
CachedView
cachedview.com
stored.website
stored.website
Wayback Machine
Explore the history of a website.
Wayback Machine Archiver
github.com
waybackpy
Python package & CLI tool that interfaces the Wayback Machine APIs.