Hazelcast - Clustering and highly scalable data distribution platform for Java
Leo Platform - Leo enables teams to innovate faster by providing visibility and control for data streams.
Apache Storm - Apache Storm is a free and open source distributed realtime computation system.
Streamdata.io - Streamdata.io provides a proxy-as-a-service that turns any request-response REST APIs into an event-driven streaming API.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Confluent - Confluent offers a real-time data platform built around Apache Kafka.