I'm looking for an
open source
cross platform
WYSIWYG
editor that I can use to write documentation. I'm not looking for a web based solution - i.e. it should work without a web server, and I want to save my files directly to disk.
The result could be any structured format, like Wiki markup, ReStructuredText, DocBook, or a small subset of HTML, ... But it's important, that
Subversion diff can be used to see differences between the versions easily (this wouldn't work with .odt or .rtf files for example)
I'm currently thinking about using Open Office, and saving the files as HTML, but is there a better solution?