This week for example Zenoss, which makes software that allows enterprises to monitor and control functions, rolled out support for CloudStack in its product. Floyd Strimling, cloud technical evangelist for Zenoss, says the company has supported CloudStack based on customer feedback.

"We're seeing a surprising amount of adoption" by end users, he says. Most of the deployments he's seen for CloudStack have been around social and gaming companies, some of whom want to build an architecture similar to that of Zynga's, which modeled its cloud and data center architecture off of Amazon Web Service's public cloud.

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Citrix created a schism in the open source cloud market when it gave CloudStack an Apache License, in effect creating a competing model to OpenStack, another open source cloud project. CloudStack has attempted to distinguish itself from OpenStack by touting its compatibility with AWS, but OpenStack officials say they too have AWS compatibility.