Authlogic and Declarative Authorization Engine for Rails 3

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DataMapper models for RESTful Authentication with Role-based Authorization

gatekeeper-rails provides a simple and beaultiful DSL to do authorization checks in rails controllers

Authorization

Helper and class methods for authlogic and declarative authorization, drying up the workflow.

Simple role based authorization for rails

Simple Authorization for Rails

Authorization Gem for Ruby and Ruby on Rails projects

Super simple authorization system for Rails

Simple role-based authorization

A high performance OAuth2 authorization server using Sinatra and Redis, inspired by Resque.

Provides matrix based and role level authorization

Really secure and simple authorization library for your Rails, Sinatra or whatever web framework, which just works.

Authorization library using namespaced strings. Great for OAuth 2.0 APIs.

A Access Control List gem to dynamicly control Authorization for users and groups.

Checkpoint provides a model and infrastructure for policy-based authorization, especially in Rails applications.

Define an ability class for each of your models to separate authorizations.

Simple authorization

Resource authorization via PORO