Gomoku.app is an extended TicTacToe game for GNUstep. You win the game if you are able to put 5 of your pieces in a row, column or diagonal.
GOX is a learning Naughts and Crosses (AKA Tic Tac Toe program) for GNOME.
GTacToe is a TicTacToe game with an enemy AI. Completely written in C++ and GTK+ 2.0. Features a two player mode with local and network play.
mptris is an interactive tic-tac-toe game with difficulty level selection support.
netToe is a Tic Tac Toe like game for the Linux console written in C using UNIX sockets.
pyXXO is a Tic Tac Toe (or Noughts and Crosses) game for 2 players.
tictactoe is an implementation of the very common game that we learn to play as kids.
When played in three dimensions with a 4x4 board, this simple game takes on an entirely new level of intellectual challenge.
Tric-Tac-Toe is a new twist (or perhaps "tilt") on the classic Tic-Tac-Toe game. The board resembles a Rubik's Cube surface; three players each take turns filling up the surface of the board.
Ultra Tic Tac Toe
Ultra Tic Tac Toe is a console-based tic tac toe (naughts and crosses) game that supports a number of features; including single-player and two-player games, and board sizes from 3x3 to 6x6. It can be compiled using MPI or pthreads, if available.