A rails plugin that handles authentication

A Devise authentication extension for Refinery CMS

Interface to the authentication token service

Registrar standardizes Authentication Responses through Rack Middleware and works well with common authentication mechanisms like OmniAuth.

Generates common user authentication code for Rails/Merb, with a full test/unit and rspec suite and optional Acts as State Machine support built-in..

Adds GitHub authentication strategies to your Webmachine resources

An authentication system with multiple strategies for the Cinch IRC framework.

The traxo_api gem provides both 'authentication' and 'client' modules to simplify the process of gaining a user's authentication and making CRUD requests to the Traxo API on their behalf.

A simple HMAC-based and time-based two-factor authentication library for usage within two-factor authentication mechanisms.

A lightweight authentication extension for Sinatra with PostgreSQL -- longer description

A thin wrapper around the Rails `flash' object to assist in redirecting the user `back' after authentication.

A Routable, but not authenticatable devise module - useful for creating api authentication schemes not based on database user

Basic authentication gem with support for Datamapper and ActiveRecord.

Spriv is a multi-factor authentication platform includes Adaptive Risk Based Two Factor Authentication that is patent protected. Most users understand that 2FA is a very good thing but won’t tolerate 2FA intervention every time they login - this is Spriv’s sweet spot! For more inform...

Firebase Authentication for Ruby client

A Rails authentication plugin that takes a minimalist approach. It is designed to be simple to understand, use, and modify for your application.

Patches Devise's token authentication strategy to add header-based token authentication to params/basic auth.

Offers authentication for rack applications.

Ruby implementation of the Secure Remote Password protocol (SRP-6a). SRP is a cryptographically strong authentication protocol for password-based, mutual authentication over an insecure network connection.

Yet Another Authentication Gem (YAAG) provides passwordless authentication for your Ruby on Rails app, all it takes is the user's e-mail address.