Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

Netty - Event-driven Asynchronous Network Application Framework

Reactor is a fourth-generation Reactive library for building non-blocking applications on the JVM based on the Reactive Streams Specification.  Reactor is a fully non-blocking foundation with efficient demand management. It directly interacts with Java functional API, Completable Future, Stream and Duration. Reactor Operators and Schedulers can sustain high throughput rates on the order of 10's of millions of messages per second.

Project Reactor -  Create efficient Reactive systems

Vert.x is a tool-kit for building reactive applications on the JVM. Vert.x is event driven and non blocking. This means your app can handle a lot of concurrency using a small number of kernel threads. Vert.x lets your app scale with minimal hardware.Vert.x is incredibly flexible - whether it's simple network utilities, sophisticated modern web applications, HTTP/REST microservices, high volume event processing or a full blown back-end message-bus application.

Vert.x - Tool-kit for building reactive applications on the JVM

RxJava is a Java VM implementation of Reactive Extensions: a library for composing asynchronous and event-based programs by using observable sequences. It extends the observer pattern to support sequences of data/events and adds operators that allow you to compose sequences together declaratively while abstracting away concerns about things like low-level threading, synchronization, thread-safety and concurrent data structures.

RxJava - Reactive Extensions for the JVM

The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. It transparently supports WebSockets, Server Sent Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP. Its mission is to make real time apps possible in every browser, library and mobile device, blurring the differences between the different transport mechanisms.
 
The Atmosphere Framework Stack works on all Servlet based servers, Spring Boot and frameworks like Netty, Play! Framework and Vert.x. We support a variety of extensions like Apache Kafka, Hazelcast, RabbitMQ, Redis and many more.

The Atmosphere Framework contains client and server side components for building Asynchronous Web Applications. It transparently supports WebSockets, Server Sent Events (SSE), Long-Polling, HTTP Streaming (Forever frame) and JSONP. Its mission is to make real time apps possible in every browser, library and mobile device, blurring the differences between the different transport mechanisms.

Atmosphere - Realtime Client Server Framework for the JVM

Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider. Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns and many advanced features while fully supporting JMS 1.1 and J2EE 1.4. Its features include: 
 <UL>
	<LI>Supports a variety of Cross Language Clients and Protocols from Java, C, C++, C#, Ruby, Perl, Python, PHP
	<UL>
		<LI>OpenWire for high performance clients in Java, C, C++, C#</LI>
		<LI>Stomp support so that clients can be written easily in C, Ruby, Perl, Python, PHP, ActionScript/Flash, Smalltalk to talk to ActiveMQ as well as any other <A href="http://stomp.codehaus.org/StompConnect" rel="nofollow">popular Message Broker</A></LI>
	</UL>
	</LI>
	<LI>full support for the Enterprise Integration Patterns both in the JMS client and the Message Broker</LI>
	<LI>Supports many advanced features such as Message Groups, Virtual Destinations, Wildcards and Composite Destinations</LI>
	<LI>Fully supports JMS 1.1 and J2EE 1.4 with support for transient, persistent, transactional and XA messaging</LI>
	<LI>Spring Support so that ActiveMQ can be easily embedded into Spring applications and configured using Spring's XML configuration mechanism</LI>
	<LI>Tested inside popular J2EE servers such as Geronimo, JBoss 4, GlassFish and WebLogic
	<UL>
		<LI>Includes JCA 1.5 resource adaptors for inbound &amp; outbound messaging so that ActiveMQ should auto-deploy in any J2EE 1.4 compliant server</LI>
	</UL>
	</LI>
	<LI>Supports pluggable transport protocols such as in-VM, TCP, SSL, NIO, UDP, multicast, JGroups and JXTA transports</LI>
	<LI>Supports very fast persistence using JDBC along with a high performance journal</LI>
	<LI>Designed for high performance clustering, client-server, peer based communication</LI>
	<LI>REST API to provide technology agnostic and language neutral web based API to messaging</LI>
	<LI>Ajax to support web streaming support to web browsers using pure DHTML, allowing web browsers to be part of the messaging fabric</LI>
	<LI>CXF and Axis Support so that ActiveMQ can be easily dropped into either of these web service stacks to provide reliable messaging</LI>
	<LI>Can be used as an in memory JMS provider, ideal for unit testing JMS</LI>
</UL>

Apache ActiveMQ is the most popular and powerful open source messaging and Integration Patterns provider. Apache ActiveMQ is fast, supports many Cross Language Clients and Protocols, comes with easy to use Enterprise Integration Patterns and many advanced features while fully supporting JMS 1.1 and J2EE 1.4.

ActiveMQ

Ratpack is a set of Java libraries for building modern HTTP applications. It provides just enough for writing practical, high performance, apps. It is built on Java 8, Netty and reactive principles. It is similar to NodeJS, helps to implement non blocking HTTP apps in Java.


Ratpack - A toolkit for JVM web applications

ParSeq is a framework that makes it easier to write asynchronous code in Java. It supports Parallelization of asynchronous operations (such as IO), Serialized execution for non-blocking computation, Execution tracing and visualization, Tasks with retry policy, Code reuse via task composition and lot more.

ParSeq - Asynchronous Java made easier

TymeacRSE is a Recursive Streams push engine for managing the publication and distribution of items to subscribers. An efficient push engine allowing (Reactive Stream) Publishers to generate asynchronous streams for routing to Subscribers. It provides an efficient multitasking service that allows many resource-intensive applications to coexist in a single microservice.

TymeacRSE - Java Reactive Streams Push Engine

Mutiny places events at the core of its design. With Mutiny, you observe events, react to them, and create elegant and readable processing pipelines. Mutiny is the perfect companion to tame the asynchronous nature of applications with non-blocking I/O. Declaratively compose operations, transform data, enforce progress, recover from failures and more. 
 
 Mutiny can be used in any asynchronous application such as event-driven microservices, message-based applications, network utilities, data stream processing, and reactive applications.

Mutiny places events at the core of its design. With Mutiny, you observe events, react to them, and create elegant and readable processing pipelines. Mutiny is the perfect companion to tame the asynchronous nature of applications with non-blocking I/O. Declaratively compose operations, transform data, enforce progress, recover from failures and more. 

Mutiny - An Intuitive Event-Driven Reactive Programming Library for Java

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