FreeIPA is an integrated Identity and Authentication solution for Linux/UNIX networked environments. A FreeIPA server provides centralized authentication, authorization and account information by storing data about user, groups, hosts and other objects necessary to manage the security aspects of a network of computers. 

FreeIPA - Identity and Access Management for Linux

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

The ultimate Python library in building OAuth and OpenID Connect servers. JWS, JWK, JWA, JWT are included. Authlib is compatible with Python2.7+ and Python3.6+.

Authlib - An ambitious authentication library for OAuth 1, OAuth 2, OpenID clients and servers.

ZITADEL provides you with all the features necessary to build great solutions, without the need of building the login and access management yourself. 
 
Its features include: 
<ul><li>Authentication:&nbsp; OpenID Connect 1.0 Protocol (OP), Username / Password,&nbsp; Machine-to-machine (JWT profile), Passwordless with FIDO2</li><li>Multifactor authentication with OTP, U2F</li><li>Federation with OpenID Connect 1.0 Protocol (RP), OAuth 2.0 Protocol (RP)</li><li>Authorization via Role Based Access Control (RBAC)</li><li>Identity Brokering</li><li>Delegation of roles to other organizations for self-management</li><li>Strong audit trail for all IAM resources</li><li>User interface for administration</li><li>APIs for Management, Administration, and Authentication</li><li>Policy configuration and enforcement</li><li>Private Labeling</li></ul>

ZITADEL provides you with all the features necessary to build great solutions, without the need of building the login and access management yourself. 

ZITADEL - Cloud Native Identity and Access Management

DotNetOpenAuth provides support for your site visitors to login with their OpenIDs by just dropping an ASP.NET control onto your page. It could be customized, how OpenID will operate on your site. It supports OpenID, OAuth and Infocards authentication. User registration and Signup of your site will be handled by this library. Users having Google, Twitter ID could login in to your site without having to create their own login.

DotNetOpenAuth - OpenID, OAuth, Infocard library for .NET

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

OmniAuth is a library that standardizes multi-provider authentication for web applications. It was created to be powerful, flexible, and do as little as possible. Any developer can create strategies for OmniAuth that can authenticate users via disparate systems. OmniAuth strategies have been created for everything from Facebook to LDAP.

Omniauth - Multi-Provider Authentication

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

OpenPAM is an Pluggable Authentication Module (PAM) library that focuses on simplicity, correctness, and cleanliness. Its aim is to gather the best features of Solaris PAM, ?XSSO and Linux-PAM, plus some innovations of its own. In areas where these implementations disagree, OpenPAM tries to remain compatible with Solaris, at the expense of XSSO conformance and Linux-PAM compatibility. 

OpenPAM - Linux Pluggable Authentication Module

SSSD is a system daemon. Its primary function is to provide access to identity and authentication remote resource through a common framework that can provide caching and offline support to the system. It provides PAM and NSS modules, and in the future will D-BUS based interfaces for extended user information. It provides also a better database to store local users as well as extended user data. 

SSSD - System Security Services Daemon

Silhouette is an authentication library for Play Framework applications that supports several authentication methods, including OAuth1, OAuth2, OpenID, CAS, Credentials, Basic Authentication, Two Factor Authentication or custom authentication schemes.

Silhouette - Authentication library for Play Framework

Ockam provides end-to-end encryption and mutual authentication for distributed applications. Transport layer security protocols are unable to protect application messages because their protection is constrained by the length and duration of the underlying transport connection. Ockam is a suite of programming libraries and infrastructure that makes it simple for our applications to guarantee end-to-end integrity, authenticity, and confidentiality of data.
 
It helps to create and manage cryptographic keys, unique device identifiers, and verifiable credentials in your connected environments.

Ockam provides end-to-end encryption and mutual authentication for distributed applications. Transport layer security protocols are unable to protect application messages because their protection is constrained by the length and duration of the underlying transport connection. Ockam is a suite of programming libraries and infrastructure that makes it simple for our applications to guarantee end-to-end integrity, authenticity, and confidentiality of data.

Ockam - End-to-end encryption and mutual authentication for distributed applications

FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols. Tokens can be added easily by scanning a QR code. If you need to generate a QR code, try our QR code generator.
 
FreeOTP implements open standards: HOTP and TOTP. This means that no proprietary server-side component is necessary: use any server-side component that implements these standards.

FreeOTP is a two-factor authentication application for systems utilizing one-time password protocols. Tokens can be added easily by scanning a QR code. If you need to generate a QR code, try our QR code generator.

FreeOTP - Two factor authentication

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 
 
Repose can be run as a standalone application (either as a Linux service or using the JAR directly), or it can be deployed as a WAR file in a servlet container alongside your origin service. Repose can be run on the same server or on a different server, and it can be run across multiple servers for horizontal scaling. At its core, Repose is a proxy that allows services to use Enterprise Integration Patterns (EIP).

REPOSE is an open-source RESTful HTTP proxy service that scales to the cloud. REPOSE provides the solution to common API processing tasks such as rate limiting, client authentication, versioning, and logging so that web service developers can focus on the unique features of their services. 

Repose - The REstful PrOxy Service Engine

OpenSC provides a set of libraries and utilities to work with smart cards. Its main focus is on cards that support cryptographic operations and facilitate their use in security applications such as authentication, mail encryption and digital signatures. OpenSC implements the PKCS11 API so applications supporting this API (such as Mozilla Firefox and Thunderbird) can use it. On the card OpenSC implements the PKCS15 standard and aims to be compatible with every software/card that supports it.

OpenSC - Open source smart card tools and middleware. PKCS#11/MiniDriver/Tokend

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