OpenStack!

Proxmox Virtual Environment is an easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines.

Google App Engine is a free* platform for developing and hosting web applications in Google-managed data centers. App Engine offers fast development and deployment; simple administration, with no need to worry about hardware, patches or backups; and effortless scalability.

Amazon Elastic Compute Cloud (Amazon EC2) is a web service that provides resizable compute capacity in the cloud. It is designed to make web-scale computing easier for developers.

CoreOS is a new Linux distribution that has been rearchitected to provide features needed to run modern infrastructure stacks. The strategies and architectures that influence CoreOS allow companies like Google, Facebook and Twitter to run their services at scale with high resilience. We've implemented them correctly so you don't have to endure the slow, learn-as-you-go infrastructure building process.

VMware vSphere Hypervisor ( based on ESXi ) is a free bare-metal hypervisor that virtualizes servers so you can consolidate your applications on less hardware.

Microsoft® Hyper-V™ Server 2008 R2 is a stand-alone product that provides a reliable and optimized virtualization solution enabling organizations to improve server utilization and reduce costs. With the addition of new features such as live migration and expanded processor and memory support for host systems, it allows organizations to consolidate workloads onto a single physical server and is a good solution for organizations who are consolidating servers as well as for development and test environments. »

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.

Google Compute Engine is not just fast. It’s Google fast. In fact, it’s a class of fast that enables new service architectures entirely..

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. Users can create theirs own virtual machine instances and manage whole virtual environment, without any hardware reconfiguration. Software supports many additional modules, which extends its base functionality.

OpenVZ is container-based virtualization for Linux.

SmartOS is a specialized Type 1 Hypervisor platform based on Illumos. It supports two types of virtualization:

Danube Cloud is a cloud management software used for deploying, maintaining and automating cloud data centers and their processes.