A service that I use since years: http://profusion.com/ ProFusion founded in 1995 at the University of Kansas, run by Intelliseek Inc.: - Search specialized search engines and databases:News, Publications, Jobs, Health, Reference, Downloads, Tech Support ... - create a specialized search by selecting exactly the engines of interest, - watch the Web: agents on ProFusion can monitor Web pages and send alerts via email when there is new information, - subscribe to what is interesting: based on topics specified. A free, public meta-search (also known as "Federated Search") engine, can perform searches on multiple internet search engines and/or specialized databases at once, provides an Alert service which tracks changes to web pages ("Page Alerts") and receive email notifications when a search turns up new results ("Search Alerts").
http://www.ittc.ku.edu/~sgauch/papers/webnet97.html Appears in: Proc. of WebNet '97, Oct. 1997, Toronto, Canada. An Adaptive Multi-Agent Architecture for the ProFusion Meta Search System Yizhong Fan, Sprint Corporation yizhong.fan@mail.sprint.com and Susan Gauch sgauch@eecs.ku.edu, Department of Electrical Engineering and Computer Science, University of Kansas "The multi-agent system consists of four different types of agents, namely, a dispatch agent, a search agent, a learning agent, and a guarding agent. ..."
http://www.ittc.ku.edu/~sgauch/papers/JUCS96.html ProFusion: Intelligent Fusion from Multiple, Distributed Search Engines Susan Gauch, Guijun Wang, Mario Gomez, Department of Electrical Engineering and Computer Science, The University of Kansas, Lawrence, KS 66045. {sgauch, gwang, mgomez}@eecs.ku.edu "ProFusion sends user queries to multiple underlying search engines in parallel, retrieves and merges the resulting URLs. It identifies and removes duplicates and creates one relevance-ranked list. If desired, the actual documents can be pre-fetched to remove yet more duplicates and broken links. ..."
http://www.ittc.ku.edu/~sgauch/papers/WebNet96.html Information Fusion with ProFusion by Susan Gauch, Guijun Wang, Department of Electrical Engineering and Computer Science, The University of Kansas, Lawrence, KS 66045, {sgauch, gwang}@eecs.ku.edu "... ProFusion's performance has been compared to the individual search engines and other meta searchers, demonstrating its ability to retrieve more relevant information and present fewer duplicates pages. Future developments include analyzing the documents for improved ranking, automatically submitting queries to the most appropriate search engines, and modifying ProFusion to be an information filtering and dissemination system. " ¶
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