LumoTray - A multi-monitor wallpaper and fullscreen manager and menu builder
FCorp My Desktop - "ALL-IN-ONE" Desktop Related Tools.
Ultramon - UltraMon is a piece of software built to help with the management of multiple screens on the same computer system. Without software like this, taking full advantage of an expanded desktop space can be difficult.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Superpaper - A cross-platform multi monitor wallpaper manager.
Walyk Wallpaper Changer - Walyk Wallpaper Changer allow you to change your wallpapers automatically or manually.