1. The Apache Kafka, Stream Processing Engine. https://kafka.apache.org
2. The Apache Storm, Stream Processing Engine. https://storm.apache.org
3. The Couchbase, NoSQL Database. https://www.couchbase.com
4. The GridDB, NoSQL Database System For IoT. https://griddb.net/en
5. The InfluxDB, Time Series Database System. https://www.influxdata.com