Coca is a chainable, devise-based scheme for delegation of authentication. It works through a standard JSON API so the packet that you pass down on auth is completely configurable. See coca-rbac for a similarly transparent RBAC implementation.

Simple authentication library for login via email

This gem builds the AWS authentication signature as described in http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html. It requires the Amazon keys, as well as options about the request (request type, resource, etc).

A portable, pluggable authentication and authorization service.

Rails authentication by email and password with integrated dependencies to MadMimi. Also provides administrative user impersonation. Based on BlueLightSpecial

Forked from ryanb's nifty-generators .A collection of useful Rails generator scripts for scaffolding, layout files, authentication, and more.

Authentication for TINYoctopus, include access_token management

Simple authentication against Atlassian Crowd

GraphAPI is a Ruby Gem created to simplifiy and help manage authentication using the Facebook Graph API.

A kind of Rack-Rscript web server which facilitates static files, cookie based authentication, and private pages.

simple-login creates a basic and simple login system for Rails 3 apps. It is based on Railscasts Authentication from Scratch videos. Usage: create your rails app, then add this gem to your Gemfile. Finally, just type 'rails g simple_login'. All these routes are available: signup_path, login_path,...

Rack compatible user authentication microservice. Can be run standalone or mounted into another rack app.

The DceLti engine simplifies integrating LTI authentication for Rails apps via the IMS::LTI gem.

A Devise plugin for exposing multiple authentication providers via omniauth.

Devise::Capturable is a gem that makes it possible to use the Janrain Engage user registration widget, while preserving your Devise authentication setup with your custom user model.

Authentication strategy for devise based on headers, passed by Oracle Access Manager.

For authenticating against PAM (Pluggable Authentication Modules)

Rails3 engine that adds OAuth2 Provider support to any application built with Devise authentication

Helps to integrate Duo Security's 2-factor authentication with Devise in a seamless way.

If you like to use Devise, but wish it had an easy token authentication system that handles a user logging in from multiple devices, DeviseMultipleTokenAuth is for you.