John's Background Switcher - Switch backgrounds to trending imgur, reddit, tumblr threads
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Wallcat - Enjoy a new, beautiful wallpaper, every day.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Quake - Quake is a series of first-person shooter video games released by id Software.