Not sure whether this would be useful to anyone, but some time ago I've written
twee plugin for my little
text editor (Windows only), which allows building twee stories without Python installation.
Example source file is available
here (in Czech, sorry :-)).
Comments
http://naracea.com/wp-content/uploads/plugin-twee-diagram.png
It is meant more as a visualization tool than full featured visual editor, thus passages still need to be added and edited as branches in editor with each passage contained in its own branch (each Naracea document can contain multiple hierarchical branches, which can be also used as a form of "pages" in single document; screenshots). There still might be some glitches which I haven't discovered -- I'll fix them as they are discovered.
I also realized there might be a problem with Windows security settings when installing plugin, therefore I added plugin in editor's installer, so it should be easier to try it now.
Plugin source code is available here.