3D

Altavir
Offers a magic clock and bubbles themed screensavers.
http://www.altavir.com

Appleblossom Art
Abstract art and fractals. Some have a matching desktop theme.
http://www.appleblossomart.com/

Astro Gemini Software
Selections include holidays, fantasy and space.
http://www.astrogemini.com/

AVS
Images include a comet tail, fire and blobs.
http://www.avs4you.com/screensavers.aspx

Free Screensavers Home
A collection with preview images, offering nature scenes, including butterflies, and lighthouses.
http://www.freescreensavershome.com/

M3DSaver
Features images and fractals using Mandelbrot and Julia Set. Demo version available.
http://www.m3dsaver.com/

MyTSoftware
A screen saver that simulates flying through a tunnel, and another which displays colorful moving patterns. [Requires DirectX]
http://www.mytsoftware.com/

NevoSoft
Collection of free and shareware screen savers. Product specifications, screen shots, and downloads.
http://www.nevosoft.com/

Paper Pilots Screensaver
Paper airplanes and balloons fly through different tranquil backgrounds. For OS X and Linux.
http://www.paperpilots.com/

3Planesoft
A variety of screen savers, including a sailing ship and a Hallowe'en theme.
http://www.3planesoft.com/pages/home.html

Potfield Screen Saver
Designed as an improvement on the standard starfield screen saver.
http://www.metalshell.com/potfield/

Screengine
Screen savers include Spartan warriors, desktop butterfly and a Klondike mine.
http://www.screengine.com