Hazelcast - Clustering and highly scalable data distribution platform for Java
ThingSpeak - Open source data platform for the Internet of Things. ThingSpeak Features
Apache Storm - Apache Storm is a free and open source distributed realtime computation system.
Azure IoT Hub - Manage billions of IoT devices with Azure IoT Hub, a cloud platform that lets you easily connect, monitor, provision, and configure IoT devices.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
AWS IoT Analytics - IoT Management