Dan Bricklin: wikiCalc (via Sam Ruby). See About wikiCalc 0.1:
The wikiCalc program is a web authoring tool that creates normal web pages. It is for creating and maintaining web pages that include data this is more than just unformatted prose, such as schedules, lists, and tables. It combines some of the ease of authoring and multi-person edit ability of a wiki with the familiar formatting and data organizing metaphor of a spreadsheet... it can be run client-side as an application that publishes by FTP or server-side using CGI.
Written in Perl. Will be GPL.
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