Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
XYplorer - File Manager for Windows
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.