Search engines can’t group results based on meaning, but iMetaSearch can. iMetaSearch groups search results by concept; click the groups that interest you and the search results will be revised accordingly. This is a powerful way to refine searches.
SearchAlyzer2 is a meta-search tool for windows that gathers results from search engines, and clusters, indexes, and sorts those results. Marking interesting results or index words finds related results or words, as shown by updated relevance bars.
SearchAlyzer is a free meta-search tool for Windows that organizes results into an interactive book with chapters, pages, and an index. Click chapters show page clusters, click index words to find related pages, or click pages to find similar pages.