KVM (Kernel-based Virtual Machine)
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.
SmartOS is a hypervisor lean enough to run entirely in memory, powerful enough to run as much as you want to throw at it. Provisioning is blindingly fast, thanks to zones and ZFS file system creation.
smartos is a specialized type 1 hypervisor platform based on illumos. it supports two types of virtualization:
os virtual machines (zones): a lightweight virtualization solution offering a complete and secure userland environment on a single global kernel, offering true bare metal performance and all the features illumos has, namely dynamic introspection via dtrace kvm virtual machines: a full virtualization solution for running a variety of guest os's including linux, windows, *bsd, plan9 and more
Productivity Networking and Admin
virtualization operating-system hypervisor solaris
KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.
Free Open Source Linux
Proxmox Virtual Environment is an easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines.
Freemium
VMware vSphere Hypervisor ( based on ESXi ) is a free bare-metal hypervisor that virtualizes servers so you can consolidate your applications on less hardware.
Commercial Windows Linux
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.
Commercial Windows Linux
portable-virtualbox is a free and open source software tool that lets you run any operating system from a usb stick without separate installation. it unpacks and adjusts the paths and configuration of virtualbox so it will run portably.
Free Open Source Windows
XenServer is a turnkey open source virtualization solution that provides out-of-the box virtualization and cloud computing.
Free Open Source Windows Linux
UCS Virtual Machine Manager (UVMM) is an easy-to-use and powerful administration tool for KVM.
Free Open Source Linux Univention Corporate Server
Danube Cloud is a software solution used for creating, managing and automating cloud data centers.
Free Open Source Web Self-Hosted