Cloud Computing Provider

This provider are supporting  Cloud Computing 

Google Apps  (www.google.com)
Amazon Aws  (aws.amazon.com)
Rackspace  (www.rackspace.com)
WindowAzure  (www.windowsazure.com)
commensus  (www.commensus.com)

Software list and provider that provide cloud software :

openstack  (www.openstack.org)
Open Nebula  (opennebula.org)
Vmware  (www.vmware.com)
Proxmox  (www.proxmox.com)
eucalyptus  (www.eucalyptus.com)