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Lively Wallpaper is a free, open-source alternative to Wallpaper Engine with great customization options
There are tons of wallpapers for Lively on sites like Reddit ... is a completely free and open-source application that can be used to set dynamic, interactive, and animated wallpapers on Windows.
3 Ways To Make Your Own Custom Animated Desktop Wallpapers
Lively Wallpaper Is Free And Easy To Use Wallpaper Engine may be the most popular option for building animated wallpapers ...