This is the problem, no there are not any open source systems which can build systems like Google has. I think that is in part because there are no open source projects of the complexity and scale of what Google builds and thus those teams haven't run into the problems that Google did and had to come up with their own ways to work around them.

When I worked there Google had 20,000 employees. More than half of them were engineers, and probably at any given moment in time 5,000 unique users might type 'build' at their desktop after having checked in a change. That means 5,000 instances get build, 5,000 regression test suites run, following at least 5,000 different 'views' into the repository. (which sat one some Perforce servers that nearly glowed from all the work they were being asked to do).

There are few places where such scale is needed, perhaps a couple of dozen, and they all have competent engineers so they all come up with their own build system.

If open source were ever to address this particular challenge, it would have to be in the creation of some really solid interfaces which would allow a build system to emerge from the tools, rather than trying to explicitly create a build system from scratch.