Looking for free tool or template to generate an online user's guide for web-based system [closed]

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I am looking for a a free template or tool to help creating an online user's guide (manual) for a web-based system. I have been searching on the web for hours and just found some expensive commercial solutions with too many funct开发者_运维百科ionalities.

I am trying to create something like http://help.eclipse.org/helios/index.jsp. Just checked that eclipse has one but seems that can be used just on eclipse RCP projects.

Do you know any free tool or template for this task? I would really appreciate any help.

Many thanks, Thiago

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Docbook good but there's a learning curve...

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Why not use an open source wiki? Or something like Doxygen will auto-generate help like documentation from source code.