RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

Alibaba Java Diagnostic Tool Arthas/Alibaba Java诊断利器Arthas

Mirror of Apache Kafka

High Performance Inter-Thread Messaging Library

The official home of the Presto distributed SQL query engine for big data

Apache Beam is a unified programming model for Batch and Streaming data processing.

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.

Distributed Graph Database

A scalable, distributed Time Series Database.

Apache Ignite

Apache Calcite

Algorithms and Data Structures implemented in Java

A production-grade java implementation of RAFT consensus algorithm.

A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others

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Ultra-fast SQL-like queries on Java collections

Dremio - the missing link in modern data

Janino is a super-small, super-fast Java™ compiler.

An open source ML system for the end-to-end data science lifecycle

Esper Complex Event Processing, Streaming SQL and Event Series Analysis

Apache ORC - the smallest, fastest columnar storage for Hadoop workloads

A simple integer compression library in Java

Concurrent Radix and Suffix Trees for Java

This is BugVM

A benchmark to compare synchronization techniques for multicore programming

Repository for Advanced Flink Application Patterns series

Benchmarks for queries over continuous data streams.