A quick and easy way to visually test out your application's API.

A modest JavaScript framework for the HTML you already have.

It's an admin, obviously.

Routing filters wraps around the complex beast that the Rails routing system is, allowing for unseen flexibility and power in Rails URL recognition and generation.

CSS toolkit from Twitter For Rails 3.1+ Asset Pipeline. Best one of all!

Integrates ServiceWorker into the Rails asset pipeline.

Ruby on Rails data listing gem with built-in sorting, filtering and in-place editing.

A simple cms and blogging engine for rails apps.

Drag&Drop GUI helper for awesome_nested_set gem. Sortable tree view helper

lazy_preload implementation for ActiveRecord models

ActiveRecord Connections Magic (slaves, multiple connections, etc)

Use the GraphiQL IDE for GraphQL with Ruby on Rails. This gem includes an engine, a controller and a view for integrating GraphiQL with your app.

Spec::Rails (a.k.a. RSpec on Rails) is a Ruby on Rails plugin that allows you to drive the development of your RoR application using RSpec, a framework that aims to enable Example Driven Development in Ruby.

ActiveRecord Connections Magic (slaves, multiple connections, etc)

Voight-Kampff detects bots, spiders, crawlers and replicants

Wiselinks makes following links and submitting some forms in your web application smarter and faster

Calendar date picker for rails

Your Rails console, 1984 style

A Rails Engine to preview plain text and html email in your browser

A time-based background job scheduler daemon (just like Cron) for Rails