Here are some of the Tic Tac Toe implementations from our technical meetup:
Clojure
https://gist.github.com/bhauman/6490813
Tic Tac Node, with Express and Socket.io
https://github.com/semmypurewal/Tic-Tac-Node
Ruby with an AI opponent
https://gist.github.com/bhauman/5493451
Ruby
https://gist.github.com/marklocklear/5491006
https://gist.github.com/marklocklear/5491002
Javascript/DynJS
https://github.com/lance/tictactoe/blob/master/game.js
Python
https://github.com/skavanaugh/TicTacToe
Clojure
https://github.com/tobias/ACL-tictactoe
Backbone.js scaffolded with Yeoman
https://github.com/krystophv/tictactoe-backbone-yo
A Java version
https://github.com/xondie/TicTacToe
AngularJS, Javascript, minimax solver
https://github.com/rmcalvert/tictactoe
Javascript + node.js (with express, socket.io packages)
https://github.com/ryanbarringtoncox/tic-bac-bone