Top AUTHENTICATION GitHub Repositories & Tools (2026)

Open Source realtime backend in 1 file

The most comprehensive authentication framework

Facial authentication for Linux

🧑‍🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.

Single Sign-On Identity & Access Management via OpenID Connect, OAuth 2, PAM

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins.

Build, run and scale AI agents like API and microservices

FreeRADIUS - A multi-protocol policy server.

The tiniest OpenID Certified™ authorization and authentication server you have ever seen.

Apereo CAS - Identity & Single Sign On for all earthlings and beyond.

Light LDAP implementation

A Web app to manage your Two-Factor Authentication (2FA) accounts and generate their security codes

Rails authentication with email & password.

OAuth 2.0 social authentication providers for ASP.NET Core

Unofficial Firebase Admin SDK for PHP

One Time Password (OTP) / 2FA for Node.js and Browser - Supports HOTP, TOTP and Google Authenticator

🔐 Authentication, Authorization, and Accounting (AAA) App and Plugin for Caddy v2. 💎 Implements Form-Based, Basic, Local, LDAP, OpenID Connect, OAuth 2.0 (Github, Google, Facebook, Okta, etc.), SAML Authentication. MFA/2FA with App Authenticators and Yubico. 💎 Authorization with JWT/PASETO tokens. 🔐

Official JavaScript repository for Clerk authentication

Firebase Admin Go SDK

Element Server Suite Community Edition