Drop this in your app, and client apps can easily use omniauth with oauth2 to use it as a source for authentication

Add facebook as a grant_type to the authentication done through devise_oauth2_providable

The Watson Authentication Handler in Ruby

The omniauth plugin to support authentication from howtodo.me

Generates yml file, inittializer, routes and a controller for basic omniauth authentication

Authentication with Remote-User HTTP header for Omniauth.

This plugin allows you to login to the Fliva platform, and use that authentication to initiate video renderings

Provides an OmniAuth strategy for Coub to make authentication with the Coub API simple

Provides an OmniAuth strategy for Drip to make authentication with the Drip API simple

This is a specific SAML strategy that handles authentication to Icelands Íslykill for OmniAuth.

OAuth2 Provider for OC Tanner's EVE authentication API

OmniAuth provider that supports authentication against UOC CAS.

Xero Partner authentication strategy for OmniAuth.

Zimbra authentication strategy for OmniAuth

Authentication done well

ruby authentication client for OpenAm

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

Provides wrapper functionality and authentication for REST and RPC HTTP requests to OpenSocial-compliant endpoints, along with validation of incoming signed makeRequest calls.

Retrieves and refreshes OpenID tokens on behalf of a user when dealing with complex authentication schemes, such as client-side certificates

Provide walled-garden authentication to public members of your github organization for your rack-based apps with warden and omniauth-github