OpenID Connect Provider and OAuth2 Authorization Server Framework

A modern authorization server built to authenticate your users and protect your APIs

Play2.x Authentication and Authorization module

OpenID Connect Provider and OAuth2 Authorization Server

Continuation of CanCan, the authorization Gem for Ruby on Rails.

An OAuth 2 client for PHP with multiple authorization flows support

An Authentication and Authorization system for wormhole corps/alliances within EVE Online

Minimalistic authorization focused on APIs