The Google Authenticator project includes implementations of one-time passcode generators for several mobile platforms, as well as a pluggable authentication module (PAM). One-time passcodes are generated using open standards developed by the Initiative for Open Authentication (OATH). These implementations support the HMAC-Based One-time Password (HOTP) algorithm specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm specified in RFC 6238. 

Google Authenticator - Two factor authentication

OpenAM provides open source Authentication, Authorization, Entitlement and Federation software. OpenAM provides core identity services to simplify the implementation of transparent single sign-on (SSO) as a security component in a network infrastructure. OpenAM provides the foundation for integrating diverse web applications that might typically operate against a disparate set of identity repositories and are hosted on a variety of platforms such as web and application servers.

OpenAM - Authentication, Authorization and SSO

pac4j  is a Java security engine to authenticate users, get their profiles and manage their authorizations in order to secure Java web applications. It supports most authentication mechanisms: OAuth (Facebook, Twitter, Google, Yahoo...), CAS, HTTP (form, basic auth...), OpenID, SAML, Google App Engine, OpenID Connect, JWT, LDAP, RDBMS, MongoDB and Stormpath and authorization checks.


pac4j - The security engine to protect all your Java web applications

This project contains a certified OpenID Connect reference implementation in Java on the Spring platform, including a functioning server library, deployable server package, client (RP) library, and general utility libraries. The server can be used as an OpenID Connect Identity Provider as well as a general-purpose OAuth 2.0 Authorization Server.

MITREid Connect - An OpenID Connect reference implementation in Java on the Spring platform

JOSSO is an Open Source Internet SSO solution for rapid and standards-based (SAML) Internet-scale Single Sign-On implementations, allowing secure Internet access to the Web-based applications or services of customers, suppliers, and business partners. It supports Windows authentication, LDAP support.

JOSSO - Java Open Single Sign-On

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any JVM-based application – from the smallest mobile applications to the largest web and enterprise applications.

Apache Shiro - Java Security Framework

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

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

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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