HyperKeys - Unleash the power of your keyboard by letting you bind ANY action to a shortcut. It's open-source and fully extendable. You can code you own actions or use one from the community !
VirtuaWin - VirtuaWin is a virtual desktop manager for the Windows operating system (Win9x/ME/NT/Win2K/XP/Win2003/Vista/Win7/Win10). A virtual desktop manager lets you organize applications over several virtual desktops (also called 'workspaces').
Skippy-XD - Skippy-XD is a full-screen task-switcher for X11.
Sysinternals Desktops - Desktops allows you to organize your applications on up to four virtual desktops.
VistaSwitcher - VistaSwitcher is an elegant and powerful task management utility for Windows OS.
9Desks - up to nine virtual desktops