Best Authentication & Identity GitHub Repositories

Light LDAP implementation

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

A high-performance and flexible authorization/permission engine built for developers and inspired by Google Zanzibar.

Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape.

Kanidm: A simple, secure, and fast identity management platform

Cerbos is an open-core authorization management platform for authorizing every identity and governing every action across applications, gateways, workloads, and AI agents.

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.

Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management

A simple ruby authentication solution.

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

Microsoft Authentication Library (MSAL) for JS

External-model router for Codex with guided Kimi OAuth/API, DeepSeek, safe migration, and rollback.

Rails authentication with email & password.

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

Amazon Bedrock Agentcore accelerates AI agents into production with the scale, reliability, and security, critical to real-world deployment.

Laravel Passport provides OAuth2 server support to Laravel.

A fully tested, abstract interface to creating OAuth clients and servers.

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.

An authorization library that supports access control models like ACL, RBAC, ABAC in Java