Portier is described as '(pronounced "Por-tee-ay") is a self-hostable login service that you can use instead of passwords. Portier sits between your website and third-party services like Google Sign-In to provide your users the fastest and easiest login experience, without ever needing' and is a authentication protocol in the security & privacy category. There are more than 10 alternatives to Portier for a variety of platforms, including Self-Hosted, Web-based, iPhone, iPad and SaaS apps. The best Portier alternative is OpenID, which is both free and Open Source. Other great apps like Portier are OAuth, LemonLDAP::NG, humanID and Twitter OAuth.