We have been big fans of Nimbula since the company launched a few years ago with its hybrid cloud management tools. Today they announced their latest version, which adds new functionality and orchestration features. It will directly support VMware's ESXi hypervisor and Cloud Foundry services, making it easier for customers to orchestrate the provisioning and monitoring of cloud-based applications.
The idea is to deliver Amazon EC2-style features but behind a corporate firewall.
You can read more about the details of the Nimbula Director v2 release here. The 2.0 version is in beta and expected to be available next month, and will be free for existing users and up to 40 cores, with a fee-based service for larger installations.