This is UnderWare 1.0.1.
Ostensibly a screensaver, but its main selling point is an animated desktop that interacts with your icons and windows. The 26 supplied desktop animation modules are very well done. The ability to have AD modules running instead of a still desktop pattern is still unique, and makes this package stand out.
You can have a different module as a screensaver, and the supplied animations can do different things when screensaving. A desktop pattern utility and patterns, on a par with Desktop Textures is also included. UW can also give you a full-screen backdrop, a la Decor and other utilities.
(Archive consists of two Disk Copy floppy images in a folder, stuffed using DropStuff 4)
UnderWare requires the following Macintosh configuration:
Mac OS 7.0 or higher
68020 Mac or above (this includes Classic II, SE/30, LC, Mac II or above)
4 MB of RAM