Shameless self promotion: My company is working on an open source distributed hypergraph database that tackles this problem, called PatternSpace. Written in C++

Shameless self promotion: My company is working on an open source distributed hypergraph database that tackles this problem, called PatternSpace. Written in C++14, uses Paxos, Cap'n Proto, lots of mechanical sympathy, and is queryable/traversable via subgraph isomorphism among other methods.