Clustering can refer to

Carrot2 - A search results clustering framework. Includes clustering components and a stand-alone meta search component.
Meta Description: [ The world's largest development and download repository of Open Source code and applications ]
Dowser - Clusters results from major search engines, associates words that appear in previous searches, and keeps a local cache of all the results you click on in a searchable database. It helps keep track of what you find on the web. [Windows, UNIX, Linux and Mac OSX.]
Grokker Web Clustering - Grokker clusters Google's results and local files. It uses an interface which visualizes clusters by means of circles.
Meta Description: [ Grokker provides federated content access to libraries and enterprises, presenting results in topically organized visual formats that make it easier to conduct actionable research across broad fields of inquiry. ]
MetaCrawler/HuskySearch/Grouper - Grouper partitioned the results into clusters, or groupings of URLs which contain similar content.
Mooter -
Query Server Web Search - The Query Server Web search page queries eight general purpose Web search engines, and returns a single merged, ranked and conceptually clustered list.
Meta Description: [ The Livelink ECM - Federated Query Server Web search page queries nine general purpose Web search engines, and returns a single merged, ranked and conceptually clustered list. ]
SnakeT - A metasearch clustering engine for Web, Books, News.
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