Jasny SSO is a relatively simply and straightforward solution for single sign on (SSO). With SSO, logging into a single website will authenticate you for all affiliate sites. The sites don't need to share a toplevel domain.

SSO - Simple Single Sign-On for PHP

M-Pin Strong Authentication System enables true two-factor authentication for web sites and applications, based on the open source M-Pin Authentication Server and M-Pin Managed Service. The M-Pin™ Managed Service is a highly available, fault tolerant software as a service that issues cryptographic secrets to M-Pin Authentication Servers and Clients.
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The M-Pin Authentication Server uses just one leak-proof cryptographic key, and can't reveal any information about your users such as identity or login details, even if the key is compromised. The M-Pin Client is an HTML5 browser, so developers can easily integrate M-Pin into their websites and applications, enabling frictionless two-factor authentication and removing all username / password vulnerabilities.

M-Pin Strong Authentication System enables true two-factor authentication for web sites and applications, based on the open source M-Pin Authentication Server and M-Pin Managed Service. The M-Pin™ Managed Service is a highly available, fault tolerant software as a service that issues cryptographic secrets to M-Pin Authentication Servers and Clients.

M-Pin - Two Factor Authentication For Web sites

multiOTP is a PHP class and a powerful command line utility OATH certified  to provide a completely free and easy operating system independent server side implementation for strong two factors authentication solution.

multiOTP - PHP class for OAUTH

privacyIDEA is a Two Factor Authentication System which is multi-tenency- and multi-instance-capable. Using privacyIDEA you can enhance your existing applications like local login, VPN, remote access, SSH connections, access to web sites or web portals with a second factor during authentication.
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It supports a wide variety of authentication devices like OTP tokens (HMAC, HOTP, TOTP, OCRA, mOTP), Yubikey (HOTP, TOTP, AES), FIDO U2F devices like Yubikey and Plug-Up, smartphone Apps like Google Authenticator, FreeOTP, Token2 or TiQR, SMS, Email, SSH keys, x509 certificates and Registration Codes for easy deployment.

privacyIDEA is a Two Factor Authentication System which is multi-tenency- and multi-instance-capable. Using privacyIDEA you can enhance your existing applications like local login, VPN, remote access, SSH connections, access to web sites or web portals with a second factor during authentication.


privacyIDEA - Modular Authentication System

Sentinel is a PHP 5.4+ fully-featured authentication & authorization system. It also provides additional features such as user roles and additional security features. Sentinel is a framework agnostic set of interfaces with default implementations, though you can substitute any implementations you see fit. <BR>
Its fetures include:
<ul>
<li>Authentication.</li>
<li>Authorization.</li>
<li>Registration.</li>
<li>Users &amp; Roles Management.</li>
<li>Driver based permission system.</li>
<li>Flexible activation scenarios.</li>
<li>Reminders (password reset).</li>
<li>Inter-account throttling with DDoS protection.</li>
<li>Custom hashing strategies.</li>
<li>Multiple sessions.</li>
<li>Multiple login columns.</li>
<li>Integration with Laravel.</li>
<li>Allow use of multiple ORM implementations.</li>
<li>Native facade for easy usage outside Laravel.</li>
<li>Interface driven (your own implementations at will).</li>
</ul>

Sentinel is a PHP 5.4+ fully-featured authentication & authorization system. It also provides additional features such as user roles and additional security features. Sentinel is a framework agnostic set of interfaces with default implementations, though you can substitute any implementations you see fit.

Sentinel - A framework agnostic authentication & authorization system.


WAFFLE is a native Windows Authentication Framework consisting of two C# and Java libraries that perform functions related to Windows authentication, supporting Negotiate, NTLM and Kerberos. Waffle also includes libraries that enable drop-in Windows Single Sign On for popular Java web servers, when running on Windows. While Waffle makes it ridiculously easy to do Windows Authentication in Java, on Windows, Waffle does not work on *nix(UNIX-like). Unlike many other implementations Waffle on Windows does not require any server-side Kerberos keytab setup, it's a drop-in solution. 

Waffle - Enable drop-in Windows Single Sign On for popular Java web servers

JSON Web Token(JWT) is a JSON based standard (RFC-7519) for creating assertions or access tokens that consists of some claims (encoded within the assertion). This assertion can be used in some kind of bearer authentication mechanism that the server will provide to clients, and the clients can make use of the provided assertion for accessing resources. This provides JWT client support in C++.

cpp-jwt - JSON Web Token library for C++

A C PAM module using libmongo-client (MongoDB C driver) and Glib to authenticate a user against a MongoDB database. The general idea of this is that to authenticate users on the network, they will have to have a valid account to a database on the mongoDB server.

pam-mongodb - PAM module to authenticate a user via mongoDB database

A Java library that keeps OAuth 2.0 service access tokens in memory for your usage.
    

tokens - Java library for conveniently verifying and storing OAuth 2.0 service access tokens

OAuth2 provider microservices based on Light-Java and SQL

light-oauth2 - A fast, light and cloud native OAuth 2

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