Document oriented:

• MongoDB
• CouchDB
• Elasticsearch

Key-value

• Memcache
• Riak
• Voldemort

Data-structures server:

• Redis

Graph:

• Neo4j
• OrienDB

Multi-model:

• PostgreSQL
• ArangoDB
• Couchbase

Object-oriented:

• ZopeDB

Wide-column store:

• Bigtable
• Dynamo
• Cassandra
• HBase
• ScyllaDB - rewrite Cassandra in C++17 with a good multi-threaded approach somewhat solves the problem of physical machines vs. virtual ones.

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