Vivisimo was a privately held technology company that worked on the development of computer search engines. The company product Velocity provides federated search and document clustering. Vivisimo's public web search engine Clusty was a metasearch engine with document clustering; it was sold to Yippy, Inc. in 2010.
The company was acquired by IBM in 2012 and Vivisimo Velocity Platform is now IBM InfoSphere Data Explorer. It stays true to its heritage of providing federated navigation, discovery and search over a broad range of enterprise content. It covers broad range of data sources and types, both inside and outside an organization.