While surfing net I just found this link which really surprised me a lot. Have a look at this, developed using PHP and Javascript.
http://www.dhtmlgoodies.com/scripts/dragable-boxes/dragable-boxes.html
Download the source from here http://www.dhtmlgoodies.com/index.html?whichScript=dragable-boxes
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check this http://www.portaneo.com/solutions/en/opensource.php
It looks very promising. I have downloaded it and will provide my view after I have tried it.