OpenNode is a open source server virtualization solution providing easy to use bare-metal ISO installer. It's based on CentOS and supports both OpenVZ container-based virtualization and emerging KVM full virtualization technology on the same host.
Virtual NetManager WAS a GTK frontend for VDE and QEMU. This project has been recently merged with Qemulator, and became Check the home page for the new project!!
OpenGL apps running inside a VM use VMGL to obtain graphics hardware acceleration. VMGL supports VMware, Xen PV and HVM, qemu, and KVM VMs; X11-based OS such as Linux, FreeBSD and OpenSolaris; and ATI, Nvidia and Intel GPUs.