A while back, a debug build of Final Fantasy XV which included a debug menu was accidently released by Square - you’ve probably seen this.
Anyway, unsurprisingly, the build included strings pretty much outlining the entire source tree of the game and engine.
For me, it’s interesting to look at as it demonstrates the seperation of the technology between ‘ebony’, ‘luminous’ and ‘reblack’, which as I understand it is a result of the lengthy development of the game and the culmination of two technologies coming together (i.e. Versus XIII’s own engine and the then new Luminous engine).
I should emphasize, there is no actual source code here. Just an outline of the tree itself. Additionally be aware it’s not going to be 100% complete.
If you want to check it out, you can take a look here.