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It seems that the issue has nothing to do with open source or not, it has to do with free or not, and with pricing policies. GigaSpaces, for example, is a commercial software that offers pay-per-use pricing on EC2 and other cloud providers. JBoss, although open source, also offers per-usage pricing. BTW, I compare the two companies' pricing schemes here: http://gevaperry.typepad.com/main/2008/07/gigaspaces-and.html Geva Perry GigaSpaces