Dynamo iOS Wallpapers - Never run out of battery with these dynamic wallpapers
Photopea - Online photo editor, which can work with PSD, XCF and Sketch files (Photoshop, Gimp and Sketch App).
Dynamic Wallpaper Club - Make and share dynamic wallpapers for macOS
Replace Cover - Create beautiful cover art for your Spotify playlists
Unsplash Wallpapers for Mac (Official) - Curated, HD desktop background photos from Unsplash.
Headers.me - Create social cover images that get you followers