slkvm is an application to provide some system tools to work with clustering and virtualization. It focuses on depending on as few external tools as possible but to also support as many virtualization technologies as possible. It works in a cluster environment where heartbeat runs virtual machines of nodes that have failed. It builds an "unheaded" cluster to avoid having a clear point of failure. It is able to build a two node cluster with everything redundant. It avoids compiling a new kernel or newer version of applications, so you can benefit from Debian security updates.
VDE (Virtual Distributed Ethernet) is an Ethernet compliant virtual network that can be spawned over a set of physical computers over the Internet. VDE is part of the virtualsquare project. VDE includes tools such as "vde_switch" and "vdeqemu". vde_switch provides several virtual ports where virtual machines, applications, virtual interfaces, and connectivity tools can be virtually plugged in. vdeqemu works as a wrapper for running qemu virtual machines that connect transparently to a specified vde_switch. VDE is also supported by qemu-kvm (KVM, Linux Kernel Virtual Machine) in versions 0.12.4 and later using the -net vde command-line option.
kvm-simple-init can perform the following actions on a KVM machine: start, stop, kill, and restart. It focuses on simplicity, and is fully implemented in just a few hundred lines of shell script. It is intended for people who do not want to run libvirt just for running a few VMs, or people who prefer to manage flat configuration files using their preferred configuration management system. It does not provide complicated configuration file format or parameters. Only two pieces of information are needed: a QEMU monitor port for the machine and the full KVM command line needed to start the machine (gives full configuration freedom). kvm-simple-init can be used directly as a system init script for starting all KVM machines on a host machine. Just drop it in /etc/init.d, and enable it with the tools provided by your UNIX distribution. kvm-simple-init was inspired by the init script of FreeBSD jails.
Xvisor is a type-1 hypervisor that aims to provide a monolithic, light-weight, portable, and flexible virtualization solution for ARMv5, ARMv6, ARMv7a, ARMv7a-ve, ARMv8a, x86_64, and other CPU architectures. It primarily supports full virtualization, and hence supports a wide range of unmodified guest operating systems. Paravirtualization is optional and is supported in an architecture independent manner (such as VirtIO PCI/MMIO devices) to ensure that no changes are required in the guest OS.
OpenNode is a server virtualization solution that provides an easy-to-use (CentOS/RHEL based) bare-metal ISO installer that supports both OpenVZ container-based and KVM full virtualization technology on the same host. The OpenNode ISO installer will set up a minimal CentOS server system with the following features: a RHEL kernel (provided by OpenVZ project) modified to support both openvz and kvm virtualization, libvirt management interface support for openvz and kvm hypervisors, func (https://fedorahosted.org/func/) client support for central management purposes, and VM template downloads provided by the opennode TUI utility.