Backdrops - The only wallpapers you'll ever need. Say hello to Backdrops.
Google Drive - Access and sync your files anywhere
WallpapersCraft - HD & 4K wallpapers
ShareFile - Secure file sharing and sync
Pitch Black Wallpaper - Pitch Black Wallpaper is an application, allowing you to set the pitch-black wallpaper to your smartphone or tablet.
Dropbox - Online Sync and File Sharing