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.
9Desks - up to nine virtual desktops
TotalSpaces - TotalSpaces provides a grid of spaces on OSX Lion
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Virtuoz - Virtuoz was designed to be a minimal and robust program that allows to have more than one desktop...