#1
Keycloak is an open-source IAM server providing single sign-on, user federation, and centralized authentication and authorization using OIDC, OAuth 2.0, and SAML.
36.4k stars8.9k forksApache-2.0last commit Actively maintained
14 self-hosted FusionAuth alternatives
FusionAuth is a developer-focused identity and access management platform providing authentication, authorization, single sign-on, MFA, user management and directory services for web, mobile and API applications. Supports OAuth2/OIDC, SAML, JWT, APIs and SDKs.
Alternatives to FusionAuth
Open-source IdP delivering SSO, OAuth2/OIDC, SAML2, LDAP, RADIUS, MFA, WebAuthn, conditional access and application-proxy capabilities for self-hosted deployments.
25.2k stars2k forkslast commit Actively maintained
#3
ZITADEL is an open source IAM/CIAM platform providing SSO, MFA, OIDC/OAuth2, SAML, user management, and multi-tenant organizations with audit logging.
14.9k stars1.3k forksAGPL-3.0last commit Actively maintained
#4
Open-source authentication and authorization infrastructure with OIDC/OAuth 2.1, SAML SSO, multi-tenancy, MFA, and RBAC for SaaS and AI apps.
14.5k stars1.2k forksMPL-2.0last commit Actively maintained
#5
Casdoor is an open-source, UI-first IAM/SSO platform supporting OAuth 2.0, OIDC, SAML, LDAP, SCIM, WebAuthn and MFA, with an admin web UI and SDKs.
14.3k stars1.8k forksApache-2.0last commit Actively maintained
Pocket ID is a simple self-hosted OpenID Connect (OIDC) provider that lets users sign in to apps using passkeys instead of passwords.
9k stars304 forksBSD-2-Clauselast commit Actively maintained
#7
Tinyauth is a lightweight auth middleware that adds a login screen, OAuth, or LDAP authentication in front of your apps via common reverse proxies.
8.2k stars264 forksAGPL-3.0last commit Actively maintained
#8
Kanidm is a secure identity management platform providing SSO, passkeys (WebAuthn), and integrations like OAuth2/OIDC, RADIUS, and LDAP gateway for legacy apps.
5.3k stars354 forksMPL-2.0last commit Actively maintained
#9
VoidAuth is a self-hosted SSO provider with OpenID Connect, ForwardAuth proxy auth, and built-in user and group management plus MFA and passkeys.
2.5k stars100 forksAGPL-3.0last commit Actively maintained
#10
Open-source Auth0/Clerk/Firebase Auth alternative with passkeys, MFA, SSO (OIDC/SAML), user management portal, and extensible auth flows for web and mobile apps.
2k stars125 forksApache-2.0last commit Actively maintained
Mozilla Accounts (FxA) is an account and authentication service used by Mozilla clients, providing login, session management, and account-related APIs for Mozilla products.
685 stars236 forksMPL-2.0last commit Actively maintained
#12
Turnkey OAuth 2.0/OIDC authentication system with admin panel, REST APIs, RBAC, MFA, social login, and flexible deployment on Cloudflare Workers or Node.js.
635 stars68 forksMITlast commit Actively maintained
#13
Lightweight Go-based authentication gateway that provides unified SSO for Plex, Jellyfin, and Emby users with OIDC, MFA and an admin console. Runs in Docker and stores profiles in Postgres.
98 stars1 forksGPL-3.0last commit Actively maintained
#14
Stackspin is an open source platform that bundles common team collaboration apps with single sign-on, centralized user management, backups, and monitoring for admins.
Activity unknown
What replacing FusionAuth actually involves
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 13 of 14 shipped a commit in the last six months. Licences in this list: Apache-2.0, AGPL-3.0, MPL-2.0, BSD-2-Clause, MIT. In exchange you take on hosting, backups and updates yourself.
Browse everything in Identity & Access Management (IAM).
