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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.

JobVille is an Italian job search engine based on Apache Solr. JobVille uses Carrot² and its Lingo clustering algorithm to generate search suggestions and similar profiles.

EB-eye Search engine at the European Bioinformatics Institute uses Carrot² to aid exploration of the returned search results.

Shumbi Discover is a next generation research tool using deep-web discovery, visual search and annotation. Shumbi embeds the .NET version of Carrot² Lingo clustering algorithm to offer on-the-fly fully automatic grouping of search results.

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.

Apache Solr is an open source enterprise search server based on the Lucene Java search library. Solr offers out-of-the-box search results clustering feature based on Carrot² algorithms.

Constellio is an open source enterprise search that lets you find all your organization's relevant content (Web, Email, ECM, CRM, Databases, etc.) with a single click. Constellio offers Carrot²-powered search results clustering.

InQuira uses Carrot² algorithms in their knowledge management products.

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.

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

gceel.com uses Carrot² to provide a A New Visual Search Interface for Web Browsing.

Struly is a multi search engine that embeds Carrot² as one of the search sources.

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

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.

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.