 <p>Check out <strong>Twitter Bootstrap</strong> - <a href="http://getbootstrap.com" rel="nofollow">http://getbootstrap.com</a> and <strong>Zurb Foundation</strong> - <a href="http://foundation.zurb.com" rel="nofollow">http://foundation.zurb.com</a>. These two are the most popular mobile responsive frameworks out right now. If you want lighter alternatives which are not as bloated, you can check out <strong>Skeleton</strong> - <a href="http://getskeleton.com" rel="nofollow">http://getskeleton.com</a></p>