Top AUTH GitHub Repositories & Tools (2026)

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

Class Variance Authority

Light LDAP implementation

Open-source auth gateway connecting 1500+ SaaS providers to AI agents through SDK, CLI, MCP, HTTP, and OpenAPI.

The most popular PHP library for use with the Twitter OAuth REST API.

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

Rails authentication with email & password.

A ruby implementation of the RFC 7519 OAuth JSON Web Token (JWT) standard.

Laravel Passport provides OAuth2 server support to Laravel.

Open-source SaaS Starter with User Roles, Organizations & Admin Panel. Built using Next.js 16, Better Auth, Drizzle, Neon, Fumadocs, Shadcn/ui, Stripe, Server Actions.

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. 🔐

Sync your Outlook and Google calendars

Easy to use OpenID Connect client and server library written for Go and certified by the OpenID Foundation

Backend controllers and scaffolding for Laravel authentication.

Official JavaScript repository for Clerk authentication

Passkeys, FIDO2 and WebAuthn .NET library.

Firebase Admin Go SDK