John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Planet Explorer - Interactive global satellite images
Unsplash Wallpaper - Gorgeous wallpapers on your Mac
himawari.js - Real-time images of Earth from the Himawari-8 satellite
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Spire - The first activity, breath & state of mind tracker