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

Ghoul is a simple yet good looking interface for your git repositories written in sinatra. It is currently only for demonstration purposes and use on your secure local machine as it does not enforce any authentication as of yet.

The Sword2Ruby gem provides Sword client functionality when run against a Sword 2.0 compliant server. It eases integration of Ruby applications with Sword servers, taking care of things like authentication, deposit-receipts and the parsing of Sword tags. It was developed as part of the JIS...

An object-oriented Ruby implementation of the Sender Policy Framework (SPF) e-mail sender authentication system, fully compliant with RFC 4408.

Omniauth plugin for Artsy authentication.

Simple and modulable authentication gem

Rails authentication framework using Mozilla Persona and the BrowserID protocol.

Gem to integrate with Bank Neon's API and its encrypted authentication process

multi authentication gem using devise & co

Basic Rails Framework files and assets for layout and authentication

Sinatra extension for user authentication with browserid.org

Firebase Authentication uses ID Token. This gem verify the token on the server side.

omniauth provider for Microsoft V2 Authentication

Gem for Rails application - provides you list of online users (for authentication gem 'devise')

Generators to add in different forms of user authentication to a rails application.

A ruby gem for using ldap to authenticate greenlight users

Firebase Authentication API wrapper for serverside. It support custom token auth. Of course it has id_token verify feature.

A reusable JWT authentication helper

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.

Token authentication for Devise which supports multiple tokens per model