Executes AWS Signature Version 4 Signing Process as explained at http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html. It calculates the signature token and provides HTTP headers with authentication data.

omniauth-azure-ad uses 'Peerialism authentication HUB' web site that manages token exchanges with the Azure ACS, encryption etc.

rack-auth-gitlabapi : provide GitLab API authentication for Rack middleware

Basic authentication library for Rack applications.

SHA1 Hashkey based authentication for simple API engine

Generates a "ready-to-go" Rails 2.3 application with authentication and other common features

Adds a kerberos ticket authentication to test-kitchen transport

The Aladin ruby library for identity and authentication

Simple authentication solution for any rails app.

A light weight Firebase access token validator whichutilizes HTTP caching to reduce network traffic whenvalidating against Google's X509 Certificates.

Gitkite is the Rails authentication engine for Google Identity Toolkit (gitkit). It provides all the endpoints and views necessary for gitkit.

A wrapper for the Globo.com's authentication/authorization API

capcoauth-gem is a library to integrate Rails applications with Capcoauth authentication service

CAS Authentication via Rack Middleware

EmpireAvenue.com authentication handler for OmniAuth

Library for create basic SSO Server based on OAUTH authentication for simplify deployment.

Simple authorization system for Rails applications. Allows you to develop applications with a mixed role based authorization and a context based authorization model. Does not supply authentication.

This gem allows you to share a central database and using authlogic stores and retrieves passwords

A portable, pluggable authentication and authorization service.

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