Here's a screenshot of Version 4.0 in action:
(Or check out this video of my Visual;Conference talk: https://www.youtube.com/watch?v=i8PP_HG-weM )
The Ren'Py Interactive Director is free for non-commercial use, where commercial use includes things like kickstarters and patreon-funded games. However, as a special exception, I am making it free for all use until April 15, 2017. This means that all NaNoRenO 2017 games - commercial and not - will be able to use the Interactive Director.
This version requires Ren'Py 6.99.12.4, and can be downloaded from:
https://www.renpy.org/dl/id/
You can also see the source code (which isn't open source, since commercial use is only permitted until April 15th) at:
https://github.com/renpy/id
The github page also has a reasonably formatted README file that has the license in it and explains how to use the Interactive Director, including a number of variables that can be used to customize it. My hope is that this will be a useful tool for the creation of NaNoRenO games this year, and I plan to support it with the appropriate level of effort to make that the case.