Mathematics

• Pi through the ages.
• Favorite mathematical constants.
• Markov Numbers.
• Mathematics information servers.
• Inverse Symbolic Calculator.
• Math-related links.
• Wallpaper Groups -- the 17 plane symmetry groups.
• Tessellation page.
• Dr. Fathauer's Encyclopedia of Fractal Tilings.
• Fractals Unleashed
• Quasicrystals.
• QuasiTiler.
• Golden Penrose -- Penrose Tilings and the Golden Mean.
• The Matrix Market Deli -- generates matrices.
• Mathematics in Movies
• Test your Telepathic Skills

Puzzles

• MathPuzzle.com -- Ed Pegg Jr.'s math puzzle page.
• Puzzles.COM.
• Meffert's Puzzles (Rubik's Cube-style puzzles that you can buy).
• Pentaplex -- Penrose Puzzles.

Games

• Cribbage Rules

Cryptography

• Cryptography.

Computer Science and Related Links

• Retro (Computer) Museum.
• Fractals.
• Gallery of Interactive Geometry.
• Solving Rubik's Cube.
• Scheme
• Java
  • Java Package Index
  • Java Name Index
  • Java Class java.lang.Object
• HTML
  • HTMLSource
    • Special Characters
  • HTML info
  • HTML tag reference
  • HTML tag reference
  • More HTML info
• Wonder Works
  • Emacs VM mail reader
• X Screen Saver
  • JWZ's page
• LWN.net (Linux info)
• Magiq Tech

Text-based Computer Games

• The Colossal Cave Adventure Page.

Commercial Computer Games

• Sir-Tech, makers of Wizardry.
• Wizardry VII monster info.
• Wizardry VIII review.

Battling Robots

• BattleBots.
• SRL (Survival Research Laboratories).
• Robot Wars.
• Robot Rumbles.

Non-Battling Robot Competitions

• 6.270 - MIT's Autonomous Robot Design Competition.