well, I guess the description is not really optional

Extend AsValue to create Ruby value objects; based on the ValueObject described by Martin Fowler in his book, 'Patterns of Enterprise Application Architecture'.

Toolkit for asymptotic analysis of functions

Simple ruby gem to provide an API for managing async processes

An Async AWS SDK adapter for `socketry/async` framework

A production-grade lightweight background job scheduler built on the Fiber::Scheduler interface itself, not on any one implementation: it runs under Async/Falcon, Itsi, or anything else that installs a scheduler. Single event loop with min-heap timer, skip-overlapping execution, jitter, monotonic clock intervals, semaphore concurrency control, and deterministic worker sharding.

iterate over enumerable objects concurrently

With EventEmitter you can build your application in Event-Driven way. It acts as global pub/sub mechanism and uses Sidekiq to reliably and asynchronously deliver messages to subscribers. Using this approach you can enforce low coupling between different components of the system.

An asynchronous experiment framework.

A minimal Ruby graph runtime that suspends on external work and resumes later.

DSL for asynchronic pipeline

async-rails project integrates Async JS for Rails 3/4 Asset Pipeline

User Messaging Async calls, compatible with Mongoid (Ruby on Rails) gem

Access mysql without blocking.

Async paperclip uploader

Wait for completion of the asynchronous procedure to obtain thats results.

library of simple asynchronous utilities for ruby

Async resource pool for fibers.

Asynchronous adaptors for Sequel.

The gem provides an abstraction for asynchronous workers that poll data from a queue and do work