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

The Google Sign-In API gives OAuth2 JSON Web Tokens (JWT) as response data upon user sign-in. A necessary step for a service provider to trust such a token is validatation. Accepting the token without validation would allow a malicious client to simply assert itself in your system. ...

Omniauth plugin for Artsy authentication.

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

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

token based authentication and more useful library..

Provides I18n integration and translations for Rodauth authentication framework.

Simple and modulable authentication gem

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

multi authentication gem using devise & co

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

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

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

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.

Minimal cookie-based authentication for Rails applications with multi-tenancy support and granular session management

A drop-in Rails engine that adds secure user registration with email confirmation to your rails 8+ application, that uses Rails Authentication Generator.

Rack middleware for using the Authorization header with token authentication

The APIMatic Core libraries provide a stable runtime that powers all the functionality of SDKs. This includes functionality like the ability to create HTTP requests, handle responses, apply authentication schemes, convert API responses back to object instances, and validate user and server data.

An Authentication framework for Merb

Adds Kerberos authentication via libsasl to the MongoDB Ruby Driver on MRI and JRuby