Is there any plugin that can help me build a circular progress bar without mainly depending on CSS3 and HTML5 canvas ?

I believe this following URL will surely hlep you.

http://www.creativesorcerers.com/inspiration/web-design/12-jquery-css3-loading-animation-and-progress-bars-plugins-tutorials/

Here is the circular progress bar created with CSS3 which wil realy help you:

http://codepen.io/geedmo/pen/InFfd

Also You can have a look on http://anthonyterrien.com/knob/ . i used it before  and its very good 

i think you should use html5 for creating a loading sign. if you hav some design skills then create a sprite image and using jquery and css margins dynamically to give it rotation. 

Might be you are looking for this kind of script at http://jsfiddle.net/oskar/Aapn8/

Additionally, You can use this Plugin as alternative in Jquery named as jquery.speedometer.js available at https://www.assembla.com/code/cornell_hci_flashback/subversion/nodes/popcore/trunk/base/static/js/jquery.speedometer.js?rev=128

Kind Regrads:

MD Danish