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
Mediamodifier - Create beautiful designs and product mockups in seconds.
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
Ocean - A Community of designers sharing feedback
Placeit - Generate realistic product shots in seconds