Source Documentation Tools

Hi,
Anybody could tell me how was the JUCE documentation generated?
It’s nice, useful and simple.

Good advices on good Source Documentation Tools are also welcome.
I’m considering:

http://www.stack.nl/~dimitri/doxygen/
http://www.doxys.dk
http://developer.apple.com/opensource/tools/headerdoc.html
http://www.naturaldocs.org/

They look good but I find them confusing and not really useful for somebody who wants to really dive into the code. They display too much information and I miss that nice tree and search form.

Thanks,
MarC

http://www.doxygen.org