VMmanager - VMmanager is a QEMU/KVM server virtualization management software, which presents perfect tools for creating virtual machines, providing VPS services, and building cloud infrastructure.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Virtkick - Virtkick is a Software as a Service VPS control panel and your company’s storefront.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
oVirt - oVirt is a virtualization management application.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.