Screen Savers Index

Album Art For The Rest of Us 1.1 Free Universal Album art screensaver for Mac OS X.
http://www.kunaldua.com/blog/?page_id=5
Requires Mac OS X 10.3 or later. iTunes 4 or later 
Album Art For The Rest of Us... A screensaver that displays random iTunes album art. Note: The screensaver needs iTunes to be running. If iTunes is not running, it will be automatically started when the screensver starts.

Aqua 3D Screensaver 1.0
http://www.apple.com/downloads/macosx/icons_screensavers/aqua3dscreensaver.html
Requires Mac OS X 10.4 or later. 
Turn your desktop into a spectacular ocean aquarium full of tropical fish swimming around your icons. Enjoy the schools of photo-realistic tropical fish, relaxing sounds of rippling water, animated bubbles & even sunlight streaming down the murky waters of your screen. The stunning 3D graphics and stereo sounds will impress you. Aqua 3D Features: - Photo-realistic 3D graphics - Amazing lighting and ripple effects - Desktop as aquarium background (may not be available on some Macs) - Stereo underwater sounds - Let the tropical fish swim over your desktop!

3D Desktop Aquarium Screen Saver 1.8 Shareware Universal 3D fish screensaver.
http://www.uselesscreations.com/mac/fish/
Requires Mac OS X 10.4 or later. Snow Leopard Compatibility
3D Desktop Aquarium Screen Saver... Watch as your monitor fills with water and real 3D fish begin to swim around the screen you were just working on! 

Explosive Reflected 5.0, freeware, Floating particles screensaver.
Requires: Mac OS X 10.4.4 or later.
Explosive Reflected is a fun and easy to use Quartz Composer screen saver for Mac OS X. It renders two particle systems that move opposite of each-other in a random manner, though slightly based on the audio input. You can choose from our collection of pre-made patterns to use as the particle image, or you can use your own. You can also choose between a single and dual particle mode, a solid or sound based gradient color, and whether you want the right, left or both particle systems activated. I hope you enjoy it!

Fireflies Free Universal Fireflies, watch them fly.
http://s.sudre.free.fr/Software/Fireflies.html
Requires Mac OS X 10.4 or later. 
This is a ScreenSaver Module for Mac OS X. It's a port of the Linux/Windows OpenGL ScreenSaver made by Matt Perry
Flying Toasters Screen Saver 3.1.0 Free Universal Toasters, watch them fly.
http://www.wurst-wasser.net/cgi-bin/wurst-wasser.net/wiki.pl?SoftwareProjectsOverview
Requires Mac OS X 10.4 or later. Snow Leopard Support
Flying Toasters Screen Saver is a screensaver of flying toasters.

HallowScream Screensaver 1.0, freeware, 10 Flash animated scenes in this Halloween screensaver.
Requires: Mac OS X 10.2.8 or later.
HallowScream Screensaver features 10 Flash animated scenes for your kooky, spooky Halloween fun!

Mac3DWatch 2.0 shareware $12 RSS and stock quotes screensaver.
http://www.softobe.com/products/m3dw/pp.html
Requires Mac OS X 10.3 or later. Core supported graphics card.
Mac3DWatch is a special ScreenSaver for MacOS X 10.3 or higher delivering RSS news feeds (it has been the first one in its category). It shows a live and spinning 3D metal watch synchronized with your local system watch, plus, optionally (in an overlaid scrolling text) your favourite and customizable RSS news feeds and Stock Quotes news feeds. So whenever the screensaver comes out, more than the local time, you will see your favourite latest RSS news scrolling on your screen. Simply hit the keys from 0 to 99 to select the channel you want to see. The user can also set up to 99 alarms which will play a sound a list of songs or an iTunes playlist at a given time. 

MatrixGL 2.2b3 Free Universal Matrix screensaver.
Requires Mac OS X 10.3 or later. 
MatrixGL is a semi-3D Matrix screensaver with a different approach to the Matrix; instead of having a simple matrix of glyphs, the screensaver arranges the glyphs in streams, which fall down independently of each other and glow upon intersecting with each other.

Minimal Screensaver 1.0 Free Universal Just fades your screen to black.
http://minimaldesign.net/downloads/miscellaneous/minimal-screensaver
Requires Mac OS X 10.4 or later. 
Minimal Screensaver is the most minimal you'll ever come across: it just fades your screen to black. That's it. I needed a screensaver with this exact functionality and I found the "do nothing screensaver" on MU but the link doesn't work anymore. I figured it would be faster to just make a new one, and since some people seemed to be looking for the old "do nothing" just like me, I just put it up here.

Our World - Nature 1.0.1 Free Universal Nature art photography screensaver.
http://www.josefderda.com/weeks/index.php?x=goodies
Requires Mac OS X 10.1 or later. 
Our World - Nature is a screensaver compatible with OS X's built-in "Screen Effects" preferences module containing more than 30 photographs. The photos are nature art photography, and are all in color. They were taken by Josef Derda, and are among many other photographs available at www.josefderda.com.

Skyrocket 1.4 Freeware Universal 3D fireworks screensaver.
http://seiryu.home.comcast.net/~seiryu/savers.html
Requires Mac OS X 10.4 or later. Mac OS X 10.5 or later is required for sound effects on PowerPC Macs. 
Now compatible with Snow Leopard.
This one is one of my favorites! Skyrocket is a screensaver that renders firework displays in 3D. Screensavers have come a long way since Pyro!, and this one renders fireworks in 3D with sound effects. Available in English and French.

Strands 1.3, freeware, Simple screen saver of flexing, flowing, glowing lines.
Requires: Mac OS X 10.4 or later. Now with 10.6 support
Strands is simple screen saver of glowing lines as they flex and flow their way across your screen. Features adjustable settings for lower-end machines and localizations in English, French and Japanese.

System 47 2.3, freeware, Star Trek screensaver.
http://www.mewho.com/system47/
Requires: Mac OS X 10.2 or later. Now with 10.6 support
System 47 is a "LCARS" style screen saver with various flashed-based animations.

xBack 3.7.6 shareware $10 View screensavers as your desktop picture.
http://www.gideonsoftworks.com/xback.html
Requires Mac OS X 10.5 or later. 
xBack allows you to display screen savers on your desktop while you work. Note to registered users of v2.x : Users of v2.x will have to purchase a new license to use v3.0 ( after the free 7 day demo period ). Registered users should use the web store and purchase the xBack v2.x to v3.x upgrade product.