Doorkeeper is an OAuth 2 provider for Rails and Grape.

Doorkeeper is an OAuth 2 provider for Rails.

Generic, Configurable OmniAuth Strategy for OAuth2 providers

Warden strategy for OAuth provider

Rails plugin for implementing an OAuth Provider or Consumer

Rails plugin for implementing an OAuth Provider or Consumer

Rails plugin for implementing an OAuth Provider or Consumer

Rails plugin for implementing an OAuth Provider or Consumer

Rails plugin for implementing an OAuth Provider or Consumer

Makes it easy(er) to make an oauth provider.

Simple OAuth 2.0 provider toolkit

Rails plugin for implementing an OAuth Provider

There are plenty of gems out there that deal with being an OAuth2 "consumer", where you redirect users to an OAuth2 "provider", allowing you to hand off authentication to a separate service. There are also plenty of gems that set you up as your own OAuth2 provider. ***BUT***, what happens when you want to separate your "authentication" server from your "resource" server? This gem is meant to be used on an API "resource" server, where you want to accept OAuth Access Tokens from a client, and validate them against a separate "authentication" server. This communication is outside the scope of the official OAuth 2 spec, but there is a need for it anyway.

A Rails Engine that allow the site to act as an OAuth provider

Wechat oauth2 provider for sorcery

Couchbase OAuth2 Provider using Couchbase

OAuth2 Provider, extracted from api.hashblue.com

Rack middleware for OAuth2 Provider Server Based on Couchdb

A simple implementation of provider protocols of oAuth 2.0 (right now just AssertionProfile).

Rails3 engine that adds OAuth2 Provider support to any application built with Devise authentication