Quick comment...

[EagleEye]

In the FAQ:

You mentioned something about “supported rendering systems”, what's that all about and which systems are supported?

CEGUI can be used with various rendering systems. There are currently CEGUI renderer modules for Microsoft® DirectX® 8.1 and 9, OpenGL, the Ogre engine, and the Irrlicht engine.

There's the Axiom engine too.

[CrazyEddie]

Yeah, you're right of course

I'll add another question like...

Q: "Is there managed/.Net support for the library?"
A: Yes, there is "ceguisharp" at http://ceguisharp.sf.net; a C# port of the library which uses the Axiom rendering engine.

Or something...

CE.