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
AWS IoT Analytics - IoT Management
Apache Ignite - high-performance, integrated and distributed in-memory platform for computing and transacting on...
Amazon Kinesis - Amazon Kinesis services make it easy to work with real-time streaming data in the AWS cloud.