FunBrain
- Practice mathematics while playing.
- http://www.funbrain.com/tictactoe/

Neave Games - Tic Tac Toe
- Players can either play against the computer, or with a friend. Can also be downloaded.
- http://www.neave.com/games/tictactoe/

Tic Tac Toe
- Provides a game against a computer player with animated pieces.
- http://www.pcbit.com/TicTacToe/

Cat 'n Moose Tic Tac Toe Game
- Game where the classical pieces have been replaced with a cat and a moose.
- http://www.catnmoose.com/tictac.shtml

StarChild: Multidisciplinary Universe Activities
- A modified version of the game that allows visitors to test their knowledge regarding Solar System facts.
- http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/activity/planet_tac_toe.html

Habitat Tic-Tac-Toe Game
- Provides education information about deep sea creatures, as well as a game where the classical pieces have been replaced with this animals.
- http://www.mbayaq.org/lc/kids_place/tictactoe/

Torus Games
- Java based game that offers the possibility to play both against another human player or against the computer.
- http://www.northnet.org/weeks/TorusGames/html/TicTacToe.html

Froggy Tic-Tac-Toe
- The pieces have been replaced with frogs in this classic version of the game.
- http://allaboutfrogs.org/funstuff/java/tictactoe/

BillyBear4Kids.com: Tic-Tac-Toe Game
- Classical version of the game where the pieces have been replaced with butterflies.
- http://www.billybear4kids.com/butterfly/tictactoe/

3D Tic Tac Toe
- A 3D Java based version of the game. Features 4 boards. The purpose is to get four pieces in a row against the computer.
- http://home.earthlink.net/~cmalumphy/3d.html