JSDB.io : JSDB is a collection of the best javascript libraries
Leaflet : A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps
The HTML5 Shiv : The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari...
stream.js : stream.js is a tiny stand-alone Javascript library that unlocks a new data structure for you: streams.
xui.js : A super micro tiny DOM library for authoring HTML5 mobile web applications.
A library to generate PDFs in client-side JavaScript.