Wallpaper Engine - Wallpaper Engine enables you to use live wallpapers on your Windows desktop.
WallpapersCraft - HD & 4K wallpapers
Lively Wallpaper - What is it? Lively is a Free and Open-Source Software (FOSS) for animated desktop wallpapers.
Backdrops - The only wallpapers you'll ever need. Say hello to Backdrops.
ScreenPlay - Open-source and cross-platform Wallpaper, Widgets and AppDrawer app.
Peppy Wallpapers - New free wall app with some lovely minimalist designs.