JustGage is a handy JavaScript plugin for generating and animating nice & clean gauges. Plugin page. 

<script src="vendors/charts/justgage/raphael-2.1.4.min.js"></script><script src="vendors/charts/justgage/justgage.js"></script>

We prepared demo samples. You don't have to use them. You can create your own demos. 

<script src="assets/js/examples/charts/justgage.js"></script>