Lemaitre is excellent

I present to you Lemaitre, an electronic duo from Oslo.

Thank you Moai

Are you looking for a cross-platform, open-source C++/Lua game engine?  I was, and I found it.  It's called Moai.  Thank you Moai.

This struck a chord

"In science if you know what you are doing you should not be doing it.
In engineering if you do not know what you are doing you should not be doing it.
Of course, you seldom, if ever, see either pure state."
—Richard Hamming, The Art of Doing Science and Engineering