Open Source Authentication Apps

Open-source backend platform with Auth, Databases, Storage, Functions, Messaging, Realtime, and Sites — deploy via Docker or use Appwrite Cloud.

OpenID Certified SSO and MFA portal for securing self-hosted web applications behind reverse proxies.

The self-hosted Identity Provider that replaces Okta, Auth0, and Entra ID with a unified SSO platform supporting SAML, OAuth2/OIDC, LDAP, RADIUS, and WebAuthn.

Open-source, self-hostable authentication platform with passkeys, biometric login, SSO, MFA, and GraphQL admin API — a full Auth0/Clerk/Firebase alternative for SaaS and mobile apps.

All-in-one self-hosted home server with SmartShield anti-DDoS, Nebula mesh VPN, automatic HTTPS, and a 250-app marketplace — all secured behind a unified auth layer.

Self-hosted secure remote access that unifies WireGuard VPN, identity management, and connection-level MFA in one open-source platform.

Open source, self-hostable authentication platform with passkeys, SAML SSO, and OAuth — the privacy-first alternative to Auth0 and Clerk.

Open-source auth infrastructure for SaaS and AI apps with OIDC, SAML, and RBAC

Self-hostable personal finance app that gives you full ownership of your financial data with a clean, minimal Rails-powered interface.

An open-source, FHIR-native healthcare platform that gives developers a compliant backend, authentication, a React component library, and serverless bots to build clinical applications in weeks instead of years.

Build product integrations with AI using 800+ APIs — auth, proxy, and TypeScript functions on production-grade infrastructure.

API-first identity and user management that handles login, registration, MFA, and recovery so your application never has to.

Open Source realtime backend in 1 file — embedded SQLite, auth, file storage, and admin UI as a single Go binary.

Privacy-first, self-hostable Proof-of-Work CAPTCHA for GDPR-compliant bot protection.

Kubernetes-native serverless platform that generates instant GraphQL and REST APIs for any database with built-in auth and real-time subscriptions

An open source, Google Zanzibar-inspired authorization database that models permissions as relationships and evaluates fine-grained access checks at massive scale with single-digit millisecond latency.

The open-source user infrastructure platform — authentication, teams, payments, emails, analytics, and more on a single unified user model.

The open-source Postgres development platform that replaces Firebase with authentication, real-time APIs, edge functions, storage, and vector embeddings — all built on PostgreSQL.

Open-source authentication platform you self-host, giving you complete control over user data with zero vendor lock-in.

Zero-trust infrastructure access platform that replaces credentials and VPNs with short-lived certificates, SSO, and identity-aware proxies for SSH, Kubernetes, databases, RDP, and AI agents.

Self-hosted SSO with OIDC, LDAP, passkeys, and proxy auth for your entire self-hosted stack

A Google Zanzibar-inspired authorization service for defining, checking, and auditing fine-grained access control across your applications.

Open-source, API-first identity platform delivering multi-tenancy, Passkeys, OIDC, SAML, and SCIM without vendor lock-in.