Database/Storage/Queue Systems

1. Graph Databases

1.1. neo4j

1.2. Titan

1.3. OrientDB

2. KeyValue Database

2.1. Redis

2.2. Riak

3. Document Database

3.1. MongoDB

3.2. CouchBD

3.3. Couchbase

4. Messaging

4.1. Apache Kafka

4.2. ActiveMQ

4.3. RabbitMQ

4.4. ZeroMQ

5. SQL

5.1. MySQL

5.2. PostgreSQL

5.3. Oracle DB

5.4. MariaDB

6. Time Series Database

6.1. influxdb

6.2. opentsdb

7. Cache

7.1. Terracotta

7.2. ehcache

8. Distributed

8.1. Casandra

8.2. Hadoop

8.3. HBase

8.4. Ceph

8.5. rethinkdb

9. Service

9.1. Firebase

9.2. compose.io