Cannie is a gem for authorization/permissions checking on per-controller/per-action basis.

A Twitter API gem with OAuth 2.0 authorization (not ready for production)

Checkin is an authorization gem for Ruby on Rails

A portable, pluggable authentication and authorization service.

PickyGuard is an opinionated authorization library.

Simple, yet super powerful authorization for you application

Authorization library used to generate upload/download tokens of Qiniu Cloud Storage.

Minimal controller-based authorization for Rails

Authorization for Rails

Rails authorization with controllers's actions.

Simple role based authorization for rails

Authorization dsl to manage permissions in rails.

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