1).Appiphony Lightning JS :
Appiphony Lighting JS(ALJS) gives harness with jQuery Library and Ember to deliver a rich UI experience to our Salesforce Lighting Design System.ALJS is implemented and maintained by Appiphony.
Click here to Getting Started with ALJS.
The library for implementing web applications based on the CSS framework Salesforce Lighting Design System is Lighting Dart.Here we can find css,icons and fonts which are useful while implement Web Applications.
Click here to Getting Started with Lightning Dart.