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').
Sysinternals Desktops - Desktops allows you to organize your applications on up to four virtual desktops.
TotalSpaces - TotalSpaces provides a grid of spaces on OSX Lion
9Desks - up to nine virtual desktops
bug.n - Provide views (i. e. virtual desktops) for showing only those windows, which you need to do your work..
Virtuoz - Virtuoz was designed to be a minimal and robust program that allows to have more than one desktop...