Zatar - IoT Analytics
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Azure Stream Analytics - Azure Stream Analytics offers real-time stream processing in the cloud.
memcached - High-performance, distributed memory object caching system
Oracle Internet of Things Cloud - Securely connect, integrate, analyze, build, and deploy innovative IoT solutions to gain business process efficiencies and data-driven insights with Oracle Internet of Things (IoT) technology.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.