See also:

• Computers: Internet: Searching: Metasearch  (63)

• Vivisimo Clustering Engine   - Their document clustering and meta-search software automatically categorizes search results on-the-fly into hierarchical clusters.

• Carrot2 - A search results clustering framework. Includes clustering components and a stand-alone meta search component.
• 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.
• MetaCrawler/HuskySearch/Grouper - Grouper partitioned the results into clusters, or groupings of URLs which contain similar content.
• Mooter
• Northern Light
• 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.
• SnakeT - A metasearch clustering engine for Web, Books, News.