Fluentd: Unified Logging Layer (project under CNCF)

Effing package management! Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity.

Acceptance test framework for web applications

Resque is a Redis-backed Ruby library for creating background jobs, placing them on multiple queues, and processing them later.

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

Thor is a toolkit for building powerful command-line interfaces.

Easy full stack backup operations on UNIX-like systems.

Wraith — A responsive screenshot comparison tool

Mechanize is a ruby library that makes automated web interaction easy.

Actor-based concurrent object framework for Ruby

HTTP (The Gem! a.k.a. http.rb) - a fast Ruby HTTP client with a chainable API, streaming support, and timeouts

Toolkit for developing sleek command line apps.

scheduler for Ruby (at, in, cron and every jobs)

🕰️ Monitor your cron jobs

Efficient, Immutable, Thread-Safe Collection classes for Ruby

A mini view framework for console/irb that's easy to use, even while under its influence. Console goodies include a no-wrap table, auto-pager, tree and menu.

Generic connection pooling for Ruby

A beautiful and powerful interactive command line prompt

An attempt to abstract this "init" script madness.

Restarts an app when the filesystem changes. Uses growl and FSEventStream if on OS X.

Write RSpec examples and generate coverage reports for Chef recipes!

UNMAINTAINED: See celluloid/celluloid#779 - Celluloid::IO-powered web server

Package any app into deb or rpm packages, using heroku buildpacks

Open source chef cookbooks.

Simple, easy-run, fast-start in-memory Chef server for testing and solo purposes

Various extensions to the base thread library.

A library for creating machines and infrastructures idempotently in Chef.

Razor is next generation provisioning software that handles bare metal hardware and virtual server provisioning

Lint tool for Chef cookbooks.

A Vagrant plugin to add Berkshelf integration to the Chef provisioners