Zoomation animates zooming shapes (B&W and 16 colors mode supported) on a white screen.  I could imagine back then people using this as a screensaver.  

Wide Flight is a very crude stars tunnel screensaver for early B&W Macs.  Pressing any key or clicking quits the application.  There is no about window or any text at all, except for the Get Info window comment: "Small version of...

Star Scape is what could be called a primitive interactive screensaver for early B&W Macs.  When you press the mouse button, it "warps" at light speed.  Else, it displays stars field animation in the direction of your mouse...

PileUp A Screen Saver PileUp piles a set of pictures, one by one and one atop another, randomly across the screen. If the pictures are cropped to the object, the screen will look like a pile of those objects, for example autumn...

Maze.saver is a Mac OS X implementation of the classic maze screen saver seen on various platforms. How to use Maze.saver : Create a folder called "Screen Savers" in your "Library" folder which is in your "Home"...

HypnOptic is a screensaver suite that did not come with many modules, but instead came with its own SDK to develop your own modules. The mad, acid, savescreen of your choice, is here again! HypnOptic is a modular and customizable package that,...

Buzzz! is an AfterDark module that simulates of a selection of animals flocking. Buzzz! features moths, wasps, flies, golfish, birds, perch & ants.  Buzzz! uses quite an extensive swarm displacement algorithm that you can almost fully tweak...

Looney Tunes for AfterDark is a module collection depicting all classic Looney Tunes characters in funny cartoon screensaver action! It features nice step animations and sounds that are typical of the 68K Mac era. Some of the Looney Tunes modules...

Blizzard is a screensaver module for AfterDark.  It displays a particles cloud with some kind of wind simulation.  Blizzard lets you customize the color of the particles, their velocity, blast speed, grids, rotation, etc...  

Midnight is a screensaver application that comes with 18 primitive screensaver modules.  Altough the modules were simple even for the time, some of them offered a bit of originality such as the "Wacky Dialog Boxes" module which...

iMorph is a pictures slideshow screensaver for AfterDark that morphs or distorts pictures.  Gore, Bush, McCain, Bradley and Ventura all get MORPHED with this iMac, G3, G4 screensaver, which randomly morphs photos on the fly. A different goofy...

Cosmos Clock is a screensaver that animates a green/black radar seeker like in sci-fi movies. Cosmos Clock's screen blanking functions can be adjusted through the "Cosmos Clock" Control Panel in your System Folder Target dates...

Flies 3D is a PPC-only B&W screensaver showing a swarm of flies moving around the screen.  Their motion resembles vector based graphics from the 80's.  Flies 3D lets you set the amount of flies, whether to display the spirtes as...

iLava is an AfterDark 2.x module displaying a photo of a lava lamp in which red goo is animated just it would in a real lava lamp.  Not a good screensaver, since old monitors could burn on the sides (no pixels are changing outside of the lava...

MacOS Warp screensaver is an AfterDark module which displays MacOS logos based on the "Warp" module, which instead of MacOS logos would display a tunnel of stars.