See
http://www.datasciencecentral.com/profiles/blogs/ten-top-nosql-databases
What will it take before Cache begins to appear on (or at the very least be considered for) such lists?
A graph database is a database that uses graph structures for semantic queries with nodes, edges, and properties to represent and store data.
Learn more on graph databases.
InterSystems Data Platform can support graph database storage because of its multi-model nature.