Welcome to the home of the Central Authentication Service project, more commonly referred to as CAS. CAS is an enterprise multilingual single sign-on solution for the web and attempts to be a comprehensive platform for your authentication and authorization needs. CAS is an open and well-documented authentication protocol. The primary implementation of the protocol is an open-source Java server component by the same name hosted here, with support for a plethora of additional authentication protocols and features.

Apereo CAS - Enterprise Single Sign On for all earthlings and beyond

Passport is Express-compatible authentication middleware for Node.js. Passport's sole purpose is to authenticate requests, which it does through an extensible set of plugins known as strategies. Passport does not mount routes or assume any particular database schema, which maximizes flexibility and allows application-level decisions to be made by the developer. The API is simple: you provide Passport a request to authenticate, and Passport provides hooks for controlling what occurs when authentication succeeds or fails.

Passport - Express-compatible authentication middleware for Node.js


NextAuth.js is a complete open source authentication solution for Next.js applications. It is designed from the ground up to support Next.js and Serverless. It is designed to work with any OAuth service, it supports OAuth 1.0, 1.0A and 2.0. It also supports email / passwordless authentication, JSON Web Tokens, database sessions.




NextAuth.js - Authentication for Next.js

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. 
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Its features include: <BR>
<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

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

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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