AppLaunchpad - Create free beautiful screenshots for App store/Google play
Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
iOS Jetpack - Beautiful easy-to-use screenshot templates for App Store
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
Smartmockups - Create stunning product mockups, easily and online.
Time Travel - Prebook rides for Uber