Create APIs in a fast and dynamic way, without the need to develop everything from scratch. You just need to create your models and let APIcasso do the rest for you. It is the perfect candidate to make your project development go faster or for legacy Rails projects that do not have an API. If you think it through, JSON API development can get boring and time consuming. Every time you use almost the same route structure, pointing to the same controller actions, with the same ordering, filtering and pagination features. APIcasso is intended to be used to speed-up development, acting as a full-fledged CRUD JSON API into all your models. It is a route-based abstraction that lets you create, read, list, update or delete any ActiveRecord object in your application. This makes it possible to make CRUD-only applications just by creating functional Rails' models. Access to your application's resources is managed by a .scope JSON object per API key. It uses that permission scope to restrict and extend access.

A gem that helps you easily handle exceptions in your Ruby on Rails API and return informative responses to the client by serializing exceptions into JSON and other popular API formats and returning a response with a status code that makes sense based on the exception.

A Rails gem for generating a JavaScript API automatically based on your ActiveRecord models.

This friendly library gives you helpers and generators to assist building RESTful API's in your Rails app.

Easy Rails API documentation.

The 'Actions' concept can help you move logic out from Controllers & Models

Easily integrate Plaid Link into your Rails application

Dead simple asset uploader attachments for your active record models

Asynchronous API communication

AuditTracker helps you centralize data tracking configuration to be used across different models

Authentication for Rails applications

An opinionated almost-turnkey solution for managing authorization in Rails

Automatically add breadcrumbs to each page by using locales

Model-side logic for autocompleting belongs_to associations

Easily use jQuery UI's autocomplete widget with Rails applications.

Fill in your brazillian addresses automagically

Framework that uses aws-ses to send newsletters

BAJA

BaseForm is a small and simple Rails plugin to work with Form Objects

Gem to conveniently handle multiple models in a single form with Rails 3 and jQuery or Prototype. Version maintained by fxposter, with some patches aimed at RailsAdmin.