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Surfboard 1.0 for Mac OS X, an application that summarizes Web pages and searches for specific information.
The application adds a set of buttons to the top of each visited Web page. These offer single-click access to Surfboard's collection of natural language tools.
More information can be found in this archived Macworld Article or in this Macworld article from Dec 2001.
(There's no download available for this software yet. If you've got a copy of that software, upload it now!)
Mac OS X 10.1
Emulating this? It should run fine under: SheepShaver