Hello, I may suggest also ZTAB (sourceforge.net/projects/ztab/). This is a free software.

Here are the functionnalities that he embeds :

* Build text adventure games and gamebooks
* Text, image and sound based aventure games.
* Simple graphical game edition (no script)
* Design as you play : you play, and if you want to enhance, you add new text and conditions and you continue to play. Nothing simpliest !
* As you design, ZTAB points out your errors.
* Generate an HTML game and upload it to your website.
* Generate a book and print it.
* Confidentiality mode
* Handle Huge projects
* You can import and export Twine and Advelh, Renpy, etc... projects too.

https://sites.google.com/site/ztabsoft/

projects and old versions here : http://sourceforge.net/projects/ztab/

new version for those who would be interested that give the opportunity to define graphically AND and OR conditions

https://sites.google.com/site/ztabsoft/
http://sourceforge.net/projects/ztab/

Hey - you guys who have used Inform7 - I read through the docs, but can't find how it outputs.  Does it generate html?
http://inform7.com/index.html

Nice! 

I’m interested in this too. I’ve been looking for software that makes it easy to structure gamebooks without requiring too much technical knowledge. It would be especially useful if it supports branching paths, choices, and an easy way to preview the final result. Has anyone here tried a tool they would recommend?