Set up basic authentication and session management with dis gem

Well rounded authenticication system for use with authlogic.

Client library for the Central Authentication Service (CAS) protocol, modified to work with Indiana University's CAS server.

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Ruby on Rails 7 Authentication and User Management Engine using Devise with a nice-looking dashboard, admin panel and login views to get you going fast on your next project.

JWT Token Authenticationt

jwt-bouncer is an abstraction for JWT-based authentication/authorisation

Json Web Token Authentication for devise users. It can be use for APIs.

Authentication middleware for Rails API that uses JWTs

Roles Management interface for virtually every backend, mostly like OmniAuth for authentication

Koinz clients require authentication via oauth koinz provider. They can also publish/subscribe for notifications in the koinz environment.

Generator that enabled LDAP authentication with a single command.

This this plugin for the leap platform provides user signup and login. It uses Secure Remote Password for the authentication.

OAuth2 (Facebook Connect) authentication strategy for connecting to lds.org thru LDS Connect with Ruby / Sinatra / etc

A Ruby gem to search postal codes across 100+ countries via the PLZ API. Supports authentication, postal code search, and country listing.

Manages collecting of facebook authentication and provides helpers. It uses koala and is built for Rails 3.

Library utilizing IDCRL for Microsoft Windows Live ID authentication.

Locomotive plugin for adding basic authentication to pages of a site

Loginza - an interactive JavaScript widget provides visitors to your sites, a wide range of options for authentication through the accounts of common WEB-portals and services

this gem provides connectivity to the Whiplash API for authentication and REST requests.