Top OAUTH2 GitHub Repositories & Tools (2026)

The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.

The most comprehensive authentication framework

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

A reverse proxy that provides authentication with Google, Azure, OpenID Connect and many more identity providers.

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

OAuth 2.0 social authentication providers for ASP.NET Core

🔐 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

OpenID/Connect, OAuth2, WS-Federation and SAML 2.0 server based on Duende IdentityServer and ITFoxtec Identity SAML 2.0 with its admin UI

The Janssen Project is a home for open source IAM components, featuring Auth Server (OAuth/OpenID), Agama low-code identity orchestration, and the Cedarling policy decision point. The "Janssen Server" distributions bundle IAM components under one control plane.

Enterprise-ready MCP Gateway & Registry that centralizes AI development tools with secure OAuth authentication, dynamic tool discovery, and unified access for both autonomous AI agents and AI coding assistants. Transform scattered MCP server chaos into governed, auditable tool access with Keycloak/Entra integration.

A secure, high-performance, multi-tenant platform for remote App ”Hosting“ and ”Computing“

Highflame ZeroID: Autonomous Agent Identity Management System (AAIMS)

command line management for Google Workspace

A WordPress plugin that provides Headless login and authentication for WPGraphQL, supporting traditional passwords, OAuth2/OpenID Connect, JWT, and more.

Experiment with Go + HTMX and OAuth2/OIDC + WebAuthn

Auth0 SDK for Apple platforms

ThunderID is a high-performance, open-source identity stack designed for developers to secure and manage access for humans, AI agents, and machines through fully composable identity flows.

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