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

The java implementation of Apache Dubbo. An RPC and microservice framework.

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex di…

Redisson - Valkey and Redis Java client. Complete Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Valkey and Redis based Java objects and services: Set, Multimap, SortedSet, Map, L…

High Performance Inter-Thread Messaging Library

Zipkin is a distributed tracing system

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

A high performance caching library for Java

Vert.x is a tool-kit for building reactive applications on the JVM

Apache Pulsar - distributed pub-sub messaging system

AWS Service registry for resilient mid-tier load balancing and failover.

Realm is a mobile database: a replacement for SQLite & ORMs

Change data capture for a variety of databases. Please log issues at https://issues.redhat.com/browse/DBZ.

A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin

Feign makes writing java http clients easier

Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more

Tools for keeping your cloud operating in top form. Chaos Monkey is a resiliency tool that helps applications tolerate random instance failures.

📈 Capturing JVM- and application-level metrics. So you know what's going on.

Pentaho Data Integration ( ETL ) a.k.a Kettle

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

GoCD - Continuous Delivery server main repository

Catch common Java mistakes as compile-time errors

Apache Storm

A tool for mocking HTTP services

Asynchronous Http and WebSocket Client library for Java

Generate Java types from JSON or JSON Schema and annotate those types for data-binding with Jackson, Gson, etc

jOOQ is the best way to write SQL in Java

The Physical Web: walk up and use anything

vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.

Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.