[DemonRaven]

http://www.ellaz.com/AIV/  Ellaz is a older chatbot that won the 2002 loebner contest created by Kevin Copple. He created AIV on the basis of Ellaz.  It is no longer for sale but if you contact him he will provide the code to activate it which will remove the annoying 40 min limit.  I have been using it to study computer programming and just adding new "memos" for it helps me and the memory training with it is a bonus.