XOS2.0 is actually written in a combination of 4 different languages.....
I just took a linecount.... 170,329 lines of code... 43,290 lines of comments.... and thats only in the core, services, and UI.... The kernel is probably another 100,00+ lines (dont have it handy for a linecount) and the scripts are probably another couple thousand.
Oh, and that doesnt even count build scripts, internal utilities, project files, the bootstrapper, etc etc etc....
All that code doesnt write itself, yknow.....
--Artifex