Tinderbox for Online Help
In O'Reilly's MacDev Center, Matt Neuburg explores Creating Online Help With Tinderbox.
Most important, because links are so easy to create, I created lots of them. It also helped that Tinderbox provides rapid searchability for a document. Thus I was able to grow an extensive outline-structured, heavily hyperlinked document with amazing speed.
...Thanks to Tinderbox, the documentation was easy to write quickly, easy to maintain, and easy to render as HTML. Developers may well wish to consider Tinderbox as their help authoring tool.