I've made a Connect Four AI. There is a text-only version and a graphical version made with Pygame. You will need Python 3 (not Python 2) to play the games (and Pygame for the graphical version.)
In the graphical version, drag the red tokens over the top of the board to make a move.
Source Code and image files zipped.
fourinarow.py (text version, doesn't need Pygame)
gFourinarow.py (graphical version, needs image files)
Black token image, Red token image, Board image