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meX-Search is a clustering search engine with a visually pleasing user interface (try version with the human agent!). meX-Search uses Carrot²'s Lingo algorithm to cluster search results.

eTools.ch is a fast meta search engine developed in Switzerland that uses bits of Carrot² infrastructure and the commercial version of the Lingo algorithm to group search results by topic.

SearchBlox is a high-performance Content Search Software designed for corporate intranets, websites, portals and custom-applications, which offers Carrot²-powered clustered search results presentation as an option.

Grokker is enterprise search management software that uses some parts of Carrot² infrastructure and the commercial version of the Lingo algorithm to cluster enterprise search results.

Focuseek used Carrot² algorithms to add the dynamic clustering feature to their enterprise search software called Nautilus.

deepVertical runs over 40 vertical search engines and uses parts of Carrot² infrastructure and the commercial version of the Lingo algorithm for search results clustering.

SideKiq can send queries to many different search engines and Carrot² is one of SideKiq's search engines showing clustered results.

Greenona features a SearchBlox search engine with Carrot²-powered search results clustering.

Nutch is open source web-search software that features a clustering plugin powered by Carrot²'s Lingo algorithm.

Five Mushrooms is a Nutch-based culinary search engine that offers search results clustering powered by Carrot²'s Lingo algorithm.

Iris is an Open Source semantic desktop application framework that enables users to create a personal map across their office-related information objects. It uses Carrot²'s Lingo algorithm to cluster web search results.