What are the top graph databases?
1. Neo4j
2. Microsoft Azure Cosmos DB
3. Virtuoso 
4. ArangoDB 
5. Amazon Neptune
<START_INST>What are the top graph databases?<END_INST><START_CTX><END_CTX><START_A>1. Neo4j
2. Microsoft Azure Cosmos DB
3. Virtuoso 
4. ArangoDB 
5. Amazon Neptune<END_A>