EventMachine is an event-driven I/O and lightweight concurrency library for Ruby. It provides event-driven I/O using the Reactor pattern, much like JBoss Netty, Apache MINA, Python's Twisted, Node.js, libevent and libev.

EventMachine - Fast, simple event-processing library for Ruby programs

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

Mio is a lightweight I/O library for Rust with a focus on adding as little overhead as possible over the OS abstractions. This is a low level library, if you are looking for something easier to get started with Tokio. Its feature include Non-blocking TCP and UDP, I/O event queue backed by epoll, kqueue, and IOCP.

Mio - Metal IO library for Rust

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.
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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

FAPWS (Fast Asynchronous Python Web Server) is a fully WSGI compliant web server for the Python environment with 2 main objectives: keep it small and asynchronous. That way it will not heat your HW resources and will assure to not fall into C10K troubles. It can handle as much as concurrent request as your kernel can handle, Gzip support for on the fly compression and lot more.

fapws3 - Fast Asynchronous Python Web Server (based on libev)

A screamingly fast, ultra-lightweight WSGI server for CPython, written in C using Marc Lehmann's high performance libev event loop and Ryan Dahl's http-parser. It is single threaded and it has less memory foot print.

bjoern - Fast And Ultra-Lightweight HTTP/1.1 WSGI Server

libco is a cooperative multithreading library written in C89. Although cooperative multithreading is limited to a single CPU core, it scales substantially better than preemptive multithreading. For applications that need 100,000 or more context switches per second, the kernel overhead involved in preemptive multithreading can end up becoming the bottleneck in the application. libco can easily scale to 10,000,000 or more context switches per second.

libco - Cooperative multithreading library written in C89.

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. 
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 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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