Uppy File Uploader : Uppy is a sleek, modular file uploader that integrates seamlessly with any application. It’s fast, easy to use and lets you worry about more important...
Workbox : JavaScript Libraries for adding offline support to web apps.
jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
React : A JavaScript library for building user interfaces
Prototype : Easy Ajax and DOM manipulation for dynamic web applications
Namespace.js is a small javascript script which provide namespacing utilities. It is framework independent. It also allows you to remotely include files.