Ask HN: Which technologies Googlers use?

I know that Google uses for production environment mostly C++ and Java, and some Python. They use Perforce instead of git/mercurial. I also know that they are very open to chosen IDE for each developer.

But what do they use for dependency management, build system, code analysis, code review, and so on...?

Besides Google it would also be interesting to know about other major tech companies like MS, Apple, FB, etc..