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Re:Cayley – An open-source graph database by bogomipz on Monday June 13, 2016 @08:27PM (#11898904)
Clair the vulnerability database for docker images uses Cayley which is how I found about it, both neat projects and worth a look:

https://github.com/coreos/clair

Re:Cayley – An open-source graph database by wrabbitfoot on Wednesday June 15, 2016 @12:42AM (#11907186)
I looked at the history of that project a while back. My recollection is that Cayley was pulled out last year. Barak Michener works at CoreOS now, but he may be quite busy.