Standard screen saver collection shipped on most Linux and Unix systems
XScreenSaver has about 150 different live wallpapers (and now daydreams as well) to use on your screen - with more coming in future editions! This is one of the best and most robust live wallpaper apps out there.
The Android port is fairly recent, some of the demos don't work yet.
If you are an Android developer and you'd like to help us finish it, source code is available at https://www.jwz.org/xscreensaver/.