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Two things:

1/ Of course Google has something very similar (actually, much larger in scale, since their team is much larger)

2/ Unlike Stripe, Google has products (AKA GSuite, Google+, etc) in the space. So, they do a lot of dogfooding of their own products for their internal directory. Many companies run on Google's version of what Stripe made.

Google has something similar internally, but I can't find any place that talks about it (that was officially talked about). The closest product that Google has in GSuite may be Cloud Search[0].

[0] https://gsuite.google.com/products/cloud-search/

Google uses an internal tool like this called MOMA. It was built by internal Google engineers. I’ve heard from friends who work at Google it’s not the best. They also have never released it publicly. As an alternative to Home, I’d suggest Google Sites or one of the startups mentioned on this thread like Tettra.co, Carrot.io, or FizBuz.com.

Full disclosure: I’m the co-founder of Tettra.

Facebook has a similar project, called Workplace which other companies can use as a private social network: https://www.facebook.com/workplace?_rdr