Celluloid Benchmark realistically load tests websites. Write expressive, concise load tests in Ruby. Use Rubinius and Celluloid forpec high concurrency. Use Mechanize for a realistic (albeit non-JavaScript) browser client.

Guava is a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, and utilities for concurrency, I/O, hashing, primitives, strings, and more!

Crunch is an alternative MongoDB driver with an emphasis on high concurrency, atomic update operations, and document integrity. It uses the Rev event library for non-blocking writes and reads. Its API is more limited than the official Mongo Ruby driver, but simpler and more Rubyish.

Collects tasks to be run, then execute in parallel, with maximum specified concurrency.

Convert video formats with custom concurrency, batch size, and conversion delay

Armstrong is an Mongrel2 fronted, actor-based web development framework similar in style to sinatra. With natively-threaded interpreters (Rubinius2), Armstrong provides true concurrency and high stability, by design.

A high-performance NATS client built on the async framework, providing fiber-based concurrency for better resource efficiency. Built on top of nats-pure with full API compatibility. WARNING: This project was developed entirely by the Windsurf AI code agent and should be considered experimental.

Angstrom is an Mongrel2 fronted, actor-based web development framework similar in style to sinatra. With natively-threaded interpreters (Rubinius2), Angstrom provides true concurrency and high stability, by design.

Interface for akka.io concurrency in jruby

A lightweight, zero-dependency, thread-safe in-process async job queue with configurable concurrency for Ruby applications.

Provides a foreign function interface for MRI that utilizes XAPI for Ruby implementations with modern garbage collection and concurrency facilities.

Mutable and immutable concurrency variable

A Ruby web server designed to have a predictable and simple concurrency model, and to be capable of running in a pure-ruby environment.

Allows you to protect the execution of a block against concurrency.

Prevent multiple sidekiq jobs with the same arguments from running at the same time.

Locker is a locking mechanism for limiting the concurrency of ruby code using the database. It presently only works with PostgreSQL.

A bare-bones Ruby HTTP server that talks Rack and uses a thread per connection model of concurrency.

Support library to provide Futures and Promises for different concurrency models.

HTTP fetch client based on ruby EventMachne and EM-HTTP-Request that has configureable concurrency regardless of EM's thread pool.

Smelt from a plentiferous gallimaufry of requests an agglomerated bale of responses. With, y'know, concurrency and all that.