Build your own cloud with Apache CloudStack
IaaS (Infrastructure as a service) is becoming more and more a norm for any corporation, moving your servers into the cloud has many advantages, uptime and dynamic out scaling of services is probably the best known out of all of them. You can now run your own cloud with Apache CloudStack. This free open source software allows you to quickly and easily take your virtual machines and host them as a cloud solution, with an API to code against, the options are endless.
You can find out by visiting : http://cloudstack.apache.org/index.html