CoreCluster is described as 'With the CoreCluster you can create private clouds, like Amazon’s EC2, but based on your own hardware. All what is necessary is some hardware with Ubuntu or Debian operating systems' and is a Virtualization tool in the network & admin category. There are more than 10 alternatives to CoreCluster for a variety of platforms, including Linux, Online / Web-based, Windows, Mac and BSD. The best alternative is QEMU, which is both free and Open Source. Other great apps like CoreCluster are OpenStack, Xen, VMware vSphere Hypervisor and Amazon Elastic Compute Cloud.
Xen.org, home of the Xen hypervisor, the powerful open source industry standard for virtualization. It is a native (bare-metal) hypervisor providing services that allow multiple computer operating systems to execute on the same computer hardware concurrently.
Apache's CloudStack is a Project backed by Citrix and designed to be a direct competitor to OpenStack. It is designed to deploy and manage large networks of virtual machines, as a highly available, highly scalable Infrastructure as a Service (IaaS) cloud computing platform.
Rackspace US, Inc. (NYSE: RAX) is an IT hosting company based in San Antonio, Texas. The company also has offices in Australia, the United Kingdom and The Netherlands and data centers operating in Texas, Illinois, Virginia, the United Kingdom, and Hong Kong in late 2008.