Virtualization packages

Core Virtualization

kernel provides e.g. the kvm hypervisor core (kvm.ko), support for running as KVM and Xen guests etc.
qemu is a CPU and device emulator; it also acts as the userspace component of KVM
libvirt is a toolkit for interacting with the various virtualization technologies
xen provides the xen hypervisor and userspace components
xenner allows Xen guests to be run on KVM
bochs PC BIOS for QEMU
gpxe PXE boot ROMs for QEMU
vgabios video BIOS for QEMU
openbios sparc/ppc BIOS for QEMU

virt-manager is a desktop user interface for managing virtual machines
virt-viewer is used by virt-manager to connect to a virtual machine's graphical console
python-virtinst provides a python API for installing virtual machines, and a bunch of useful utilitis like virt-install and virt-clone
gnome-applet-vm is a GNOME applet for monitoring and controlling virtual machines
virt-top is a top-like utilitiy for virtual machines
libguestfs provides an API and tools for accessing and modifying virtual machine disk images
guestfish lets you access and modify virtual machine disk images from the command line
libguestfs-tools provides useful tools: virt-df, virt-cat, virt-edit, virt-ls, virt-inspector, virt-rescue, virt-win-reg
libguestfs-mount (guestmount) lets you mount virtual machine disk images on the host
collectd-libvirt gathers statistics from within virtual machines
appliance-tools enables the building of virtual appliance images
cobbler is a network boot server that can be used to provision virtual machines
perl-Sys-Virt-TCK is a functional test suite for libvirt
virt-v2v is a tool for converting virtual machines to use the KVM hypervisor

kvm used to provide the userspace component of the kvm hypervisor. It has since been replaced by qemu
etherboot has been replaced by gpxe
virt-mem is going to be replaced by other virt tools