s5-tools

• S5 + Instiki - A little out of date. Will replace with the instructions for .10 in the near future.

• Friwikiwiki - PHP and DHTML, in development. Plans XUL version.

• Soapbox - Rails based editor

• [1] - S5 Presents - another Rails based editor, download available

• S5 for Plone - as the name suggests

• S5 module for Oddmuse

• S5 plugin for OmniOutliner 3 - no web page I could fine; this is the download

• Restructured Text (reST) to S5 converter

• Schema support for S5 including, notably, a slideshow DTD and S5-to-Atom

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Note that there are other slide formats as listed here: Slide ML by Bitflux, PerlPoint by Jochen Stenzel and Slidy by Dave Raggett of W3C.