Concord.io

Concord is a distributed stream processing framework built in C++.

Apache Apex

Apache Apex is an enterprise-grade unified stream and batch processing engine.

Apache Beam provides an advanced unified programming model to implement batch and streaming data processing jobs.

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

Azure Stream Analytics offers real-time stream processing in the cloud.

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

Disco is a lightweight, open-source framework for distributed computing based on the MapReduce…

Gearman provides a generic application framework to farm out work to other machines or processes that are better suited to do the work.

Google Cloud Dataflow is a fully-managed cloud service and programming model for batch and streaming big data processing.

Open-source software for reliable, scalable, distributed computing

Hadoop-Related

Lightbend Fast Data Platform is the easy on-ramp to successful streaming Fast Data applications.

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

scikit-learn (formerly scikits.learn) is an open source machine learning library for the Python programming language.

Tigon is an open source real-time stream processing framework built on top of Apache Hadoop and Apache HBase.

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

logstash is a tool for managing events and logs.