Does anyone care about dependencies as long as they're packaged or can be installed automatically?

It's a real documentation system rather than just an HTML generator, which is what docsgen seems to be. It supports syntax highlighting, search and DevHelp generation. It maintains a database of symbols and lets you refer to them instead of having to manually look up the link.

And there's also an optional component, hotdoc-server, to allow previewing and editing documentation on-line.

Well, and it ships with lots of documentation.