ruby

Sampling CPU profiler for Ruby

A foreign exchange rates and currency conversion API

Database Sharding for ActiveRecord

Do some browser detection with Ruby. Includes ActionController integration.

Ruby Date Recurrence Library - Allows easy creation of recurrence rules and fast querying

An awesome asynchronous event-driven reactor for Ruby.

A make-like build utility for Ruby.

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

Bash command line framework and CLI generator

The Ruby community's gem hosting service.

Preflight for HTML email

🎹🎸A music theory library with a command-line interface

Vagrant provider for libvirt.

All sorts of useful information about every country packaged as convenient little country objects. It includes data from ISO 3166 (countries and states/subdivisions ), ISO 4217 (currency), and E.164 (phone numbers).

Build reactive applications with the Rails tooling you already know and love.

🕰️ Monitor your cron jobs

Magical authentication for Rails 3 & 4

A very fast & simple Ruby web server

Ruby and Rails efficient Kafka processing framework

Curated list: Resources for machine learning in Ruby