* [Doorkeeper::OpenidConnect v1.9.0](https://github.com/doorkeeper-gem/doorkeeper-openid_connect) – OpenID Connect provider for Rails, adding authentication and identity features on top of an OAuth 2.0 framework.

* [Doorkeeper v.5.9.0](https://github.com/doorkeeper-gem/doorkeeper) – OAuth 2 provider for Ruby on Rails and Grape applications.