Deplate: Cross-Publish Wiki-based Documents to Other Formats
Deplate is a Ruby-based tool written by Thomas Link to convert documents written in wiki-like markup to various output formats. Supported output formats include LaTeX, HTML, "HTML slides", DocBook (which means it can also convert to PDF, and other DocBook-supported output), and plain text.
In addition to being capable of reading various Wiki markup variants, a particularly interesting feature is it also handles rdoc input which is very handy for generating print-ready documentation of your Ruby projects.
To see the results for yourself, various samples of Deplate generated output are available for your viewing pleasure. To get it, you can download the stable version from Deplate project files page or check out its latest development version from CVS.