Adds core features so other engines can hook into the framework.

PropertyWebBuilder lets you build great real estate websites fast.

Assertion grant extension for Doorkeeper.

Adds social network login services (OAuth) to Solidus

Maestrano Enterprise - essentials API

Token auth for grape apps

Rails engine supporting multiple auth providers per user.

Add social network capabilities to your projects.

Auto Mount Facebook Login

Scaffold for OmniAuth

Scaffold for OmniAuth.

Recruiter is a Rails Engine for adding job posting functionality to a Rails APP. Users should be able to post articles

token based authentication and more useful library..

Social Stream is a Ruby on Rails engine providing your application with social networking features and activity streams. This gem packages the basic functionality, along with basic actors (user, group) and activity objects (post and comments)

Includes functionality for site-specific registration and third-party authentication strategies such as social networks (Facebook, Twitter and Linkedin) and freemail providers (Yahoo, Windows Live and Gmail) with support for external database authentication.

#Crowdsourcing management system for #RubyOnRails: http://bit.ly/voluntary-0-7-1

Devise + Omniauth Authentication encapsulated in an Engine. Uses Devise. Parts taken from perens-instant-user and sso-devise-omniauth-provider

Gem packaging of Catarse, a crowdfunding application.

Citygate is an Engine that provides user model with sign up and log in, admin backend for managing users.

Blacklight plugin for virtual local repositories from Digital Commonwealth