3. Answers.com

Launched: 1999

Known for: Gives Consolidated Responses Taken From Several Sources

Answers.com was created in 1999 by Bob Rosenschein in Jerusalem, Israel. The website was then known as GuruNet.com which later acquired the Answers.com domain name. This search engine enables knowledge exchange which includes wiki WikiAnswers, ReferenceAnswers, VideoAnswers, and five international language Q&A communities.

This search engine intelligently and automatically integrates and retrieves information from disparate sources and delivers the result in a single consolidated view to the user. The searches can be made based on several categories.