lightning design system is very sharp and neat UI. But Salesforce yet not providing any JS framework for SLDS(salesforce lightning design system).
I found two of JS framework. They both are providing JS for SLDS.
A. Appiphony Lightning JS (ALJS):
Click Here to Getting Started with ALJS.
B. Lightning Dart:
The Framework is not dependent on salesforce.com functionality or context and can be used independently.Click Here to Getting Started with Lightning Dart.
If you know some other JS frameworks. Please type in comments. I will add here. Make it useful for others.
Original Blog Here