Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
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.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
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').
Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
Sysinternals Desktops - Desktops allows you to organize your applications on up to four virtual desktops.