John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Trickster - Keep track of recent files on your Mac
Muzei - Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art.
Work For FANG - No-bullshit guide to land a job in top tech companies
Variety Wallpaper Changer - Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use.
Viscom SlideShow Creator - Free Create photo slideshow movies and presentations for 4 steps.