Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Madame Tussauds - Crowdsourced 3D scanned gallery of the celebrity museum
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
DeviantArt muro - DeviantArt muro is an HTML5-powered drawing application that lets you create artworks using the simple touch of your fingertips.
Splashify - Beautiful desktop wallpapers for Mac and Windows
Sketchfab for Museums - Browse thousands of cultural artifacts in 3D and VR