Amos Storkey - Visual Illusion of the Month  
   Collection of illusions and images chosen for novelty and distinction from the usual set found in most collections.
   http://www.anc.ed.ac.uk/~amos/visualillusion.html

Eyetricks.com  
   Optical illusions, 3D stereograms and anaglyphs, fractals and brain teasers
   http://www.eyetricks.com/

IllusionWorks  
   A multimedia museum of optical and sensory illusions, with online demonstrations and explanations.
   http://psylux.psych.tu-dresden.de/i1/kaw/diverses%20Material/www.illusionworks.com/

Eye Magic: Optical Illusions  
   Offers a number of optical illusions for viewing, as well as explanations on how they work.
   http://www.harmsy.freeuk.com/eyemagic.html

Opticalillusions.ws  
   Many optical illusions, optic tricks and brain teasers.
   http://www.opticalillusions.ws

Skytopia - Dynamic Optical Illusions  
   A selection of old, new and original optical illusions. Many pictures are enhanced via the use of 3D and animation.
   http://www.skytopia.com/project/illusion/illusion.html

Optical Illusions for Kids  
   Offers a collection of illusions, brain teasers, and puzzles for children.
   http://www.indianchild.com/3d%20mainpage.htm

Just Optical Illusions  
   Focus on geometric optical illusions by Gianni A. Sarcone and Marie J. Waeber
   http://www.geocities.com/just_optical_illusions

Mindfake.com  
   Site contains a collection of optical illusions, online games, and other fun things.
   http://www.mindfake.com

Cut the knot: Visual Illusions  
   A collection of about 20 illusions - all accompanied by Java applets. Interactively changeable attributes help investigate which ones are in fact responsible for tricking the brain.
   http://www.cut-the-knot.org/Curriculum/index.shtml#illusions

Mentalillusion.com  
   Various illusion resources, including some illusion puzzles.
   http://www.mentalillusion.com

Akiyoshi's illusion pages  
   Many works of Akiyoshi Kitaoka. Designs around standard illusions crafted to maximise the illusory effect.
   http://www.ritsumei.ac.jp/~akitaoka/index-e.html

Fun puzzles  
   A selection of standard optical illusions along with some online puzzles and games.
   http://www.optical-illusions.fun-puzzles.com/

All Optical Illusions  
   Gallery of optical illusions, 3d art, puzzles, and visual gags.
   http://www.allopticalillusions.com

Optical Illusions?  
   Comments on the terms 'Optical Illusion' and 'Visual Illusion'.
   http://www.anc.ed.ac.uk/~amos/opticalillusion.html

Cool Optical Illusions  
   A growing collection of optical illusions and eye tricks, including original illusion pictures and a collection of optical illusion desktop wallpaper.
   http://www.coolopticalillusions.com

Mchael Bach: Optical Illusions & Visual Phenomena  
   The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.
   http://www.michaelbach.de/ot/index.html

Optical Magic Optical Illusions  
   A selection of common images.
   http://www.goodtricks.net/optical-illusions-optical-magic.html

Optical Illusion Archive  
   A collection of optical illusion images, 3D street art, and flash demonstrations.
   http://www.unoriginal.co.uk/optical1.html

Planet Perplex  
   Selection of optical illusions, hidden images, impossible objects and upside down images.
   http://www.planetperplex.com

Amazing Eyetricks  
   Gallery of pictures that will trick your eyes.
   http://www.fun4all.dk/eyetricks/

Optical Illusions  
   Amazing Pictures and Effects
   http://www.panoptikum.net/optischetaeuschungen/opticalillusions.htm

Subliminal Messages  
   Impossible figures, optical illusions, multimedia and 3D puzzles.
   http://www.SubliminalMessages.com