Wayback Machine - Browse through over 150 billion web pages archived from 1996 to a few months ago.
Inferno - An extremely fast React-like javascript library for building modern user interfaces.
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
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
Time Travel - Prebook rides for Uber
w2ui - W2UI is a small JavaScript UI library with a complete set of widgets: layout, grid, sidebar, toolbar, tabs, fields, popup, utilities.