QAuthRubyClient can be mounted into any Q-App to deal with all q-apps services like authentication

Make a connection to the prooflink connect api for single sign on authentication

A doorman for your Rack application. Checks if REMOTE_USER matches the subdomain. Requires some authentication means to set REMOTE_USER.

Easy RESTful authentication + authorization.

Persephone is a gem which implements simple OAuth2 token based API authentication for Rails 4+ and Mongoid 5+

Supports all API calls, HTTP Basic and OAuth2 authentication

For authentication through proxy auth

A paper based two factor authentication.

Simple key/secret based authentication for apis

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

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

ruby authentication client for OpenAm

Authentication done well

Zimbra authentication strategy for OmniAuth

Xero Partner authentication strategy for OmniAuth.

OmniAuth provider that supports authentication against UOC CAS.

OAuth2 Provider for OC Tanner's EVE authentication API

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

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

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