Guard::Reek automatically runs Reek when files change

Guard::Resque automatically starts/stops/restarts resque worker

Ruby Critic is a tool that listens to modifications in Ruby classes, modules and methods and reports any new code smells it finds.

Guard::Spin automatically manage Spin server.

Find anyone's email address

Rails GUS API library based on official REGON SOAP api.

Easily embed charts with Google Visualization API, using ruby formatted options in your view files

Ruby's interface of graphviz

An easy to use interface for REST APIs that use HAL.

A set of helpers to write Chef cookbooks as Ruby gems.

View helpers for Ruby applications

A simple way to grab recent activity on a given model grouped by hour, day, week or month (time series). Supports "padding" for intervals without activity.

Utility method build on top of Ruby dig to navigate hashes mixed up with arrays.

Ruby implementation of Hawk

A Jekyll extension that adds in Live Reload

Hazel is a generator for Sinatra apps, heavily based on snfn

Hashicorp Configuration Language parser and checker for Ruby

This gem adds a helper and generator to facilitate the use of Head JS in your Rails 3 projects the same way you would normally add javascript tags using Rails default helpers.

Simple Heatmap generator in Ruby. (Requires ImageMagick)

Ruby Help Scout (aka HelpScout) SDK, using Mailbox API v2.0