
I came across this old missionary game the other day and have since found two places where you can play it for free online - and one where you can download it for free. Have fun!
Play for free (each one has a different look to it):
http://games.yahoo.com/free-games/missionaries-and-cannibals
http://www.learn4good.com/games/puzzle/boat.htm
Free download:
Download Missionaries and Cannibals 1.1.0