Hi!
I've been working on a visual novel maker for some months now and i think it's time to let it out and get feedback from users.
It's splitted in two components: a graphical editor and an engine.
The graphical editor uses C++ with Qt4 , which allows it to run on a variety of operating systems including Windows (XP, Vista and 7), OS X and GNU/Linux.
On the other hand the engine is made using Javascript and HTML5, which makes it very easy to deploy your game into all sorts of devices, as long as they have a browser that supports the HTML5 canvas tag (this requirement may change in the future).
I haven't got time to make a personalized web page for it, so for now you can look at the project homepage here: https://savannah.nongnu.org/projects/belle
If you want to check out the source code: http://git.savannah.gnu.org/cgit/belle.git. By the way, this project is licensed under the GNU GPLv3.
I've also created an entry on qt-apps.org and on kde-apps.org, where you can find more information, source code in a tarball and see some screenshots!
Thanks!