Vivisimo

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 IBM Watson Explorer, 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 specialized in federated search and document clustering. For example, Vivisimo clustering could divide the results of a search for "cell" into groups including "biology", "battery", and "prison".

Vivisimo software supported both structured and unstructured information.