I would like to run hadoop program in a hadoop cluster to test times. Is any free Hadoop Cluster available for experiments with big data for Academic use?
Actually, there is a free cluster for Greek academics (I assume you are Greek), provided by GRNET, in case you haven't found it already. I have been using it for over two months:
https://okeanos.grnet.gr/home/
However, you'll probably have to setup everything by yourself, since I don't believe that there is a public image with hadoop.
UPDATE (for future reference): It seems that there is now an easy wizard-like way to set up a hadoop cluster, too.