====== Graph Databases ======
  * neo4j
  * http://ontotext.com/knowledge-hub/documentation/
  * https://www.arangodb.com/
  * Microsoft Cosomos DB


===== Info =====
https://www.infoq.com/news/2016/12/graph-processing-facebook

https://github.com/neo4j-contrib/neo4j-spark-connector

https://spark.apache.org/docs/latest/graphx-programming-guide.html