» Vivisimo Clustering Engine    Their document clustering and meta-search software automatically categorizes search results on-the-fly into hierarchical clusters.    http://vivisimo.com/

» Carrot2    A search results clustering framework. Includes clustering components and a stand-alone meta search component.    http://sourceforge.net/projects/carrot2/

» 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    http://dowser.sourceforge.net/

» Grokker Web Clustering    Grokker clusters Google's results and local files. It uses an interface which visualizes clusters by means of circles.    http://www.grokker.com

» MetaCrawler/HuskySearch/Grouper    Grouper partitioned the results into clusters, or groupings of URLs which contain similar content.    http://www.cs.washington.edu/research/projects/WebWare1/www/metacrawler/

» Mooter        http://www.mooter.com/

» Northern Light        http://www.northernlight.com/

» 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.    http://www.queryserver.com/web.htm

» SnakeT    A metasearch clustering engine for Web, Books, News.    http://snaket.di.unipi.it/