Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape.

OpenID Connect extension for Doorkeeper

🔐 oauth2 - A Ruby wrapper for the OAuth 2.0, & 2.1 Authorization Frameworks, including OpenID Connect (OIDC)

A tool to manage rack apps in development with puma

A Ruby gem to easily create SAML 2.0 messages.

OmniAuth is a flexible authentication system utilizing Rack middleware.