Vivisimo was a privately held technology company in Pittsburgh, Pennsylvania, specialising in the development of computer search engines. The company was acquired by IBM in May 2012 and is now branded as , a product of the IBM Watson Group. Vivisimo's public web search engine Clusty was a metasearch engine with document clustering; it was sold to Yippy, Inc. in 2010.
Vivisimo software supported both structured and unstructured information.
Vivisimo was founded in 2000 by three computer science researchers at Carnegie Mellon University: Chris Palmer, Jerome Pesenti, and Raul Valdes-Perez. The name was taken from the Spanish superlative adjective vivísimo meaning "very lively" or "very clever."
Velocity was sold as an installed or hosted application to enterprises, governments, and OEMs. With Vivisimo providing additional professional services.
Velocity's social search features allowed users to contribute to organizational content by tagging, voting, annotating and sharing search results. The contributions are instantly indexed in new searches.