Ruby SDK for the Machine Payments Protocol (MPP) — an HTTP 402 Payment Authentication scheme.

A full featured wrapper for interacting with the base Google Data API, including authentication and basic object handling

omniauth provider for Microsoft V2 Authentication

Use Google Apps as an Authentication Provider

Ruby implementation of the BitID authentication protocol

Time Based OTP/rfc6238 authentication for Devise

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.

AnyCable Rails helpers for JWT-based authentication

Easy authentication to an LDAP server(s)

Rack middleware for using the Authorization header with token authentication

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

fmrest-core is a FileMaker Data API client built with Faraday. It handles authentication as well as providing many utilities for working with the Data API. An ORM library built on top of fmrest-core is also available.

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

Simple and modulable authentication gem

A Ruby on Rails engine for authentication with Dailycred.

A Ruby client for Bing Ads API that includes a proxy to all Bing Ads API web services and abstracts low level details of authentication with OAuth2.

Rails authentication framework using Mozilla Persona and the BrowserID protocol.

Add AWS Signature 4 style authentication to grape API's.

A reusable JWT authentication helper

The Blockstack ruby library for identity and authentication