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You can already pull it from the git repository on sourceforge: Isdge.sf.net
A first realease will come as soon as I implemented animations, which probably still takes a few months.
No, the engine itself is licenced under MIT, which means that you can basicly do whatever you want with it for free. It however utilizes some third party libraries, which is currently only bullet, which is licenced with the zlib/libpng license, which is a little more restrictive than MIT, as it asks you to mention that it ois used, or something like this. For more information about the licenses, just put their name into google and you will find the license texts.
As I plan to add Android support somewhen in the future, it should also be able to develope with iSDGE on Windows. And if it turns out to be extremely easy, it may also gets a Windows and/or Mac port for quick testing.
No, it isn´t cell shading. Just a texture with little detail. But cell shading would of course be possible.