The simplest way to add passwordless authentication to your Rails/Rack application.

Simple and modulable authentication gem

Draugiem.lv authentication strategy for OmniAuth

Signature authentication

Authentication with BasicAuth.

Generator that enabled LDAP authentication with a single command.

Make a connection to the prooflink connect api for single sign on authentication

An extremely easy way to protect your site by requiring Google logins without having to set up a traditional authentication system

A user authentication middleware built with Sinatra and Warden

A minimal dependency library for interacting with a Cerner OAuth 1.0a Access Token Service for invoking Cerner OAuth 1.0a protected services or implementing Cerner OAuth 1.0a authentication.

dynamoid-devise is flexible authentication solution for Rails 4.1.x with Warden using dynamoid as ORM...

Mozilla BrowserID/Persona authentication module that works with Rails 3.1+ and Devise 2.1+

Ember-auth is an authentication framework for ember.js. It is expected to work out of the box with rails + devise.

Fluentd plugin that store data to be forwarded, and send these when client(input plugin) requests it, over HTTPS and authentication

Use phpbb for authentication in your rails app

Faraday based API client for the PayPal REST API. Includes support for saving the authentication token and limited release endpoints.

[Unofficial] Authentication Strategy for Warden to allow Amazon Cognito user sign in and JWT

A generator for creating Rails applications ready to go. It generates the layout, the style, the internationalization and manage external gems for authentication, authorization and other. It also provides a customized scaffold to generates cool sites ajax ready in few minutes. If you find a bug p...

Rack middleware for transparent authentication with NTLM. This is a fork from lukefx/rack-ntlm on Github. This makes the Rack middleware a gem and uses net/ldap to search the user against an ActiveDirectory server. This is work in progress, so contributions are welcome.

NoPassword is a Ruby on Rails gem that allows session authentication with a token or a magic link via an email sent to the user; there is no need for a password.