Wallcat - Enjoy a new, beautiful wallpaper, every day.
Gratitude Flow - Gratitude Flow is a web extension that allows you to share and receive gratitude on your new tab with real people around the world.
Splashy - Breathtaking, auto changing wallpaper app for macOS, Windows, Linux, iOS & Android
Google Arts & Culture - Explore collections of art and culture from around the world, both past and present.
Irvue - (previously Unsplash Wallpaper) Gorgeous wallpapers on your Mac.
New Tab by Flickr - Get a beautiful photo each time you open a new tab