The best open source alternative to Wallch is Variety Wallpaper Changer. If that doesn't work for you, our users have ranked five alternatives to Wallch, but unfortunately only two of them is open source. If you can't find an alternative you can try to remove all filters.
Variety is a wallpaper changer for Ubuntu which is featureful, yet slim and very easy to use. It can automatically download wallpapers from various online sources, allows rotating them on a regular interval or on demand, and provides easy to use ways to separate the great images...
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Muzei is a live wallpaper that gently refreshes your home screen each day with famous works of art. It also recedes into the background, blurring and dimming artwork to keep your icons and widgets in the spotlight.
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