A natural language system working in restricted "blocks worlds" with restricted vocabularies, worked extremely well
Involved fully automatic translation of more than sixty Russian sentences into English.
A simulation of a Rogerian psychotherapist, rephrasing her response with a few grammar rules.
A knowledge representation system in the tradition of semantic networks and frames; it is a frame language.
A natural language interface to a database of information about US Navy ships.
A chatterbot with stated aim to "simulate natural human chat in an interesting, entertaining and humorous manner".
Yahoo , Google , Bing
A question answering system that won the Jeopardy! contest, defeating the best human players in February 2011.
An Intelligent Personal Assitant