Amazon WorkSpaces - Amazon WorkSpaces is a managed desktop computing service in the cloud.
Dexpot - If you don't have Dexpot yet, the new update makes it a must-have tool for Windows, adding a ton of features to your desktop that you never knew you wanted.
Shells - Shells is your personal workspace in the cloud. Join Shells now to access your own, private virtual desktop environment powered by a cloud computer.
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').
Amazon EC2 - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Sysinternals Desktops - Desktops allows you to organize your applications on up to four virtual desktops.