software for organizing world-building?

[Primitius]

So I have quite a complex work forming which i've detailed in many different word documents, all of which have many folders and sub-folders. The whole things getting a bit messy. I would like some form of software (preferably freeware) that makes it easier to sort and look through my files and sort of gives me a sense of the over-all project.
I've looked at things like evernote and generic folder organizing software, as well as a piece of software called liquid story binder, but i'm not sure they offer exactly what i'm looking for.
So how do you guys organize your vast project folders? Does anyone else use specific software, or just get by using many sub folders etc?

 

[Aes]

Let's say such a piece of software did exist, or might exist in the future. What exactly is it you would want said software to be able to do? Are you just trying to organize text for characters, cultures, and cities, or is it more complex than that, with pictures mixed in? Be as specific as possible.

 

[Arthur_Connelly]

Need a little more detail. Are you talking about having everything under an index that will allow you to jump to whichever file you click on or something with more depth, including edits and a wiki-like interface?

 

[jojajihisc]

Storybook

yWriter

 

[Arthur_Connelly]

Storybook looks very nice. Like Power Writer, only for free.