Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.

EventMachine implements a fast, single-threaded engine for arbitrary network communications. It's extremely easy to use in Ruby. EventMachine wraps all interactions with IP sockets, allowing programs to concentrate on the implementation of network protocols. It can be used to create both network ...

Celluloid enables people to build concurrent programs out of concurrent objects just as easily as they build sequential programs out of sequential objects

A concurrency framework for Ruby.

Cool.io provides a high performance event framework for Ruby which uses the libev C library

A Ruby gem for performing work in background threads.

Dataflow concurrency for Ruby (inspired by the Oz language)

Eventbox is a model of concurrent computation that is used to build thread-safe objects with arbitrary interfaces. It is [kind of advancement](#comparison-threading-abstractions) of the well known [actor model](https://en.wikipedia.org/wiki/Actor_model) leveraging the possibilities of the ruby la...

Actors based concurrency library for Ruby.

A lightweight, extensible asynchronous event routing framework in Ruby.