tracks_changes provides a way to easily keep track of changes to ActiveRecord models at an attribute level and maintains the typecasting in the database.

Description of AuditTrails.

Augment an ActiveRecord class by including one or moe additional ActiveRecord extension classes. The augmented class will inherit all attributes and methods, including those provided by ActiveRecord such as getters and setters, as local.

Allows ActiveRecord Models to be easily structured as a tree

Integrate Aurelia.io in your Rails project.

Auth1 is a Rails Engine for Auth0. Auth1 provides everything you need to use Auth0 in your Rails application.

Automatic authorisation auditing for your Rails app

auth_api gem provides restful api for registration and authentication of users

Description of Authcenter.

Description of TinyForum.

Auth Client

Opinionated app strategy used for authentication & role-based authorization.

AuthEng is just Devise only with a different flow.

A rails authentication and authorization engine that reduces clutter in your controllers and views. Includes aliased link_to and button_to helpers that return an empty string if the current user is not permitted to follow the link. ...

Provide a Rails authentication active model.

This gem provides a Rails generator to create a registration form and related files.

Devise + Omniauth Authentication encapsulated in an Engine. Uses Devise. Parts taken from perens-instant-user and sso-devise-omniauth-provider

This generator can add powerful authentication and authorization to a clean Rails application with a single command. Configures a Rails application for use with the authlogic and declarative_authorization gems, and generates all code (migrations, models, controller methods, routes, roles, seeds,...

Rails plugin to interface with authhub.

This gem will handle the integration of your app with the Authic service