Vivisimo 的聚类，由Carnegie Mellon University的研究者开发，得到了Yahoo! Internet Life (YIL)杂志7月期的“最佳的新的搜索服务”称号（“The technology is based on a specially developed algorithm to group or cluster textual documents. The software calls other search engines like Yahoo! and MSN and extracts the relevant information (titles, URLs, and short descriptions), and groups it based on this summarized information. The output is a clear and hierarchical folder structure, allowing users to avoid link overload and to click only on the specific category of information that they need.”）。显然，自动聚类改善了搜索结果的排列，且不增加成本。
Blinkx 发布了3.0版本的软件，其 smart folders 也值得关注：“blinkx understands the content of your documents and assigns them to folders accordingly. You can choose to assign content to folders explicitly or enjoy the benefits of implicit categorization, allowing blinkx to create and maintain folders for you automatically.”
Accoona 的人工智能。一个与 China Daily 合作，并且在克林顿帮助下于2004年12月上线的引擎。宣称采用了超越关键词匹配的人工智能技术（“Accoona Artificial Intelligence is a Search Technology that understands the meaning of search queries beyond the conventional method of matching keywords. This user-friendly technology, merging online and offline information, delivers more relevant results and enhances the user experience.”）。
