Cassandra is an open source distributed database management system (DBMS) designed to handle large amounts of mission-critical data, with low latency, scalability, and fault-tolerance.
PostgresQL is an open source object-relational DBMS which focuses on multi-version concurrency control, reliability, data integrity, and correctness.
mySQL is an open source relational management database (RDBMS) providing quick processing, flexibility and ease of use, resilient execution, and proven reliability.
Neo4j is the most popular graph database. It?s an ACID-compliant transactional database which allows for highly-functional read/write scalability while maintaining data integrity.
DynamoDB is a fully managed NoSQL database providing nearly infinite scalability with fast and predictable performance.
Hbase is an open source DBMS running on top of Hadoop Distributed File System (HDFS) and allows for the storage of large quantities of sparse data in a fault-tolerant way.
MongoDB is an open source document-oriented NoSQL database using JSON-like documents with schemas.