1. Heron is a realtime, distributed, fault-tolerant stream processing engine.

  2. STORM is a free and open source tool for testing web services.

  3. Confluent offers a real-time data platform built around Apache Kafka.

  4. SQLstream, Big Data stream processing software, powering smart services for the Internet of Things from streaming machine and sensor data.

  5. Leo enables teams to innovate faster by providing visibility and control for data streams.

  6. ExtraHop is a stream analytics platform that provides the fastest, richest, most complete visibility into all activity in IT infrastructure.

  7. Apache Spark is an engine for big data processing, with built-in modules for streaming, SQL, machine learning and graph processing.

  8. alooma brings together a reliable data pipeline, an easy data transformation interface, and a powerful stream processor.

  9. Streamdata.io provides a proxy-as-a-service that turns any request-response REST APIs into an event-driven streaming API.

  10. Flink is a streaming dataflow engine that provides data distribution, communication, and fault tolerance for distributed computations.