Hazelcast - Clustering and highly scalable data distribution platform for Java
Confluent - Confluent offers a real-time data platform built around Apache Kafka.
Apache Storm - Apache Storm is a free and open source distributed realtime computation system.
Spark Streaming - Spark Streaming makes it easy to build scalable and fault-tolerant streaming applications.
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Google Cloud Dataflow - Google Cloud Dataflow is a fully-managed cloud service and programming model for batch and streaming big data processing.