Bill van Hecke's Helpify is a nice tool to convert OmniOutliner documents to Apple HelpBooks.
I wonder, if other tools are available to create HelpBooks, e.g. a CMS with pre-configured templates.
Do you know of any HelpBook generator tools?
There's Help Generator, which parses a simple XML format and creates help books that look very similar to Apple's (at least in the Leopard/Snow Leopard timeframe).