Portier is described as '(pronounced "Por-tee-ay") is a self-hostable login service that you can use instead of passwords' and is an app in the Security & Privacy category. There are more than 10 alternatives to Portier for a variety of platforms, including Online / Web-based, iPhone, iPad, Windows and Linux. The best alternative is OpenID, which is both free and Open Source. Other great apps like Portier are OAuth (Free, Open Source), LoginRadius (Paid), 10Duke Identity Provider (Paid) and LemonLDAP::NG (Free, Open Source).
OpenID is an open standard that describes how users can be authenticated in a decentralized manner, eliminating the need for services to provide their own ad hoc systems and allowing users to consolidate their digital identities.
OAuth is an open standard for authorization. It allows users to share their private resources (e.g. photos, videos, contact lists) stored on one site with another site without having to hand out their credentials, typically supplying username and password tokens instead.
10Duke Identity Provider makes it easy for your customers to access and register to multiple applications with single username and password or using their favorite social login, secures profile data and easily integrates with leading business tools.
LemonlLDAP::NG is a modular Web-SSO based on Apache::Session modules. It simplifies the build of a protected area with a few changes in the application. It manages both authentication and authorization and provides headers for accounting.
A project of the Bluenumber Foundation, humanID is an independent single sign-on built for privacy and designed to restore integrity to the web. We believe the path to a safer internet is a user-centric digital identity system that is both accountable and anonymous.
Place a button on your site or application which allows Twitter users to enjoy the benefits of a registered user account in as little as one click. Works on websites, iOS, mobile and desktop applications.
IndieAuth is a way to use your own domain name to sign in to websites. It works by linking your website to authentication providers such as Twitter or Google, then entering your domain name in the login form on websites that support IndieAuth.