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- RxJava: It is implemented out of the ReactorX project which hosts implementations for multiple programming languages and platforms. ReactiveX is a combination of the best ideas from the Observer pattern, the Iterator pattern, and functional programming. For more information about ReactiveX, see the Introduction to ReactiveX page.
- Project Reactor: Reactor is a framework built by Pivotal and powered by Spring. It is considered as one of the foundations of the reactive stack in the Spring ecosystem. It implements Reactive API patterns which are based on the Reactive Streams specification.
- Akka Streams: Although it implements the Reactive Streams implementation, the Akka Streams API is completely decoupled from the Reactive Streams interfaces. It uses Actors to deal with the streaming data. It is considered a 3rd generation Reactive library.
- Ratpack: Ratpack is a set of Java libraries used for building scalable and high-performance HTTP applications. It uses Java 8, Netty, and reactive principles to provide a basic implementation of Reactive Stream API. You can also use Reactor or RxJava along with it.
- Vert.x: Vert.x is a foundation project by Eclipse which delivers a polyglot event-driven framework for JVM. It is similar to Ratpack and allows to use RxJava or their native implementation for Reactive Streams API.
- ReactiveX (Rx)
