Database/Storage/Queue Systems

1. Service

1.1. Firebase

1.2. compose.io

2. Messaging

2.1. Apache Kafka

2.2. ActiveMQ

2.3. RabbitMQ

2.4. ZeroMQ

3. Cache

3.1. Terracotta

3.2. ehcache

4. Distributed

4.1. Casandra

4.2. Hadoop

4.3. HBase

4.4. Ceph

4.5. rethinkdb

5. Document Database

5.1. MongoDB

5.2. CouchBD

5.3. Couchbase

6. SQL

6.1. MySQL

6.2. PostgreSQL

6.3. Oracle DB

6.4. MariaDB

7. Graph Databases

7.1. neo4j

7.2. Titan

7.3. OrientDB

8. KeyValue Database

8.1. Redis

8.2. Riak

9. Time Series Database

9.1. influxdb

9.2. opentsdb