Truefactor.io can be your only authentication option or you can add it to existing auth schemes such as devise, authlogic etc.

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

Token based authentication

Authenticate users through Google in your app using devise and omniauth

This is a fork of Grack that adds Branch Level Access control and LDAP Authentication

The email equivalent of has_secure_password for ActiveRecord.

A CLI tool and its associated Ruby library that help you locate and reconnect to a running SSH agent. Useful in automation scenarios where multiple processes must repeatedly open SSH connections leveraging a one-time authentication pass

Developed for a specific use case: User has an AWS id in a master account and wants to assume a role in another account. This module exposes a single authenticate() method that handles authentication and switching role by referencing the user's aws secrets.

Rack middleware to abstract Sanger SSO

Provides token-based authentication for Rails API apps.

Simple RSS parser that supports feeds with HTTP Basic Authentication

Rubius provides a simple interface to RADIUS authentication

This is a Rack endpoint that provides Flickr authentication. Basically it is a lightweight alternative to the "omniauth-flickr" gem.

Ruby Role-Based Authentication

Plugin that adds token authentication methods to Roda

A ruby interface to the GitHub Contributions Archive API (https://githubcontributions.io). Get information about GitHub users and events, including all repositories a user has contributed to. No authentication required.

Ruby PAM (Pluggable Authentication Modules) integration

Users and Authentications service

Central Authentication Service for Reviewed.com

A gem providing HMAC based authentication for HTTP. This is the DNC Labs fork.