AnswerBus - Answers natural language questions in English, French, Spanish, German, Italian or Portuguese.
Answers Project - A search engine that stores questions and answers submitted by users. This allows for answers to questions to be found instantaneously without having to search a page for that answer.
Ask why! - The system answers why-questions by searching for relevant paragraphs in Wikipedia.
BrainBoost - Question answering engine that accepts natural language queries.
Language Computer Corporation - Includes a demonstration of the company's search technology designed to provide direct answers to simple factual questions.
START - Demonstration from the MIT InfoLab Group of its natural language question answering system, developed by Boris Katz.
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