On gamedev.net, there is currently shown an 'image of the day' of a very nice looking project named 'Orient: A Hero’s Heritage
'. They are explaining that they were using an open source 3D engine for the game, but won't tell its name because "it's no big deal, we changed it so much that it's something else". They assert that the license of that engine allows this and that the engine is for C#. Which made me wonder if they used Irrlicht.
And actually, there is a postmortem of the game
(Summary: big fail) where they write that they used Irrlicht. Nice, and a pity that the game wasn't finished. But after thinking about it again, maybe they deserved this with their attitude that it is ok to take the source of Irrlicht, probably change some few lines of code and then claim that's all theirs now. I don't have that much insight into this project, and maybe they are even nice guys, but more and more companies seem to base their business model on ripping off or at least taking advantage of open source projects without the intention of giving back anything at all. Maybe I'll write a detailed article with some examples about this soon. :)