Answers.com, a service of GuruNet (Amex: GRU - news - people ), may be the answer engine leader these days.

FORBES

The search engine will answer queries by automatically identifying cameras, microphones and other sensors that can contribute to the question.

BBC: Researchers work on smart city search engine

Ask Jeeves began as a search engine to answer plain English questions, with its staff diligently anticipating what would be asked.

FORBES

Answer Guy SEO Consulting and Search Engine Optimization for that story, some examples, and even the guarantee we offer.

FORBES: Small Biz Technologies I'm NOT Buying in 2011

The engine maker has no answer.

FORBES: Institutional Stupidity, III

"We'd go out for a run and talk business issues and I'd lose my breath trying to answer, " says Matt Nichols, Pandora's director of search engine marketing.

WSJ: Finding Exercise That's in Tune with Work

The free program aims to answer questions directly, rather than display web pages in response to a query like a search engine.

BBC: Web tool 'as important as Google'