dtSearch Network allows for instant text and field searches across an enterprise network.  Provides over two dozen indexed and unindexed text search options for all popular file types. Supports full-text as well as field searching in all supported file types. Has multiple relevancy-ranking and other search sorting options.

http://www.dtsearch.com/PLF_network_2.html

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http://www.dtsearch.com
  
The dtSearch product line can instantly search gigabytes of text across a desktop, network, Internet or Intranet site.