identity-idp by 18F

Ruby SAML Identity Provider, best used with Rails (though not required). Maintained by saml-idp on GitHub, where it has earned 284 stars from the community.

Scope-based authorization for Ruby on Rails. Maintained by makandra on GitHub, where it has earned 334 stars from the community.

Ultra lite authorization library. Maintained by dzaporozhets on GitHub, where it has earned 321 stars from the community.