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- 33,180
- License
- Apache-2.0
- Last commit
- 23 hours ago
JavaActive
Best Identity & SSO Tools
Identity and single sign-on (SSO) servers for authentication and user management.
Identity and single sign-on (SSO) platforms provide centralized authentication and user management for applications and services. Open-source solutions in this category range from full-featured identity servers to lightweight adapters that integrate with existing directories. These platforms support standards such as OAuth 2.0, OpenID Connect, and SAML, enabling both internal users and external customers to access resources with a single set of credentials. They are commonly deployed on-premises or in cloud environments and can be extended through APIs or custom plugins.
Top Open Source Identity & SSO platforms
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- 27,058
- License
- Apache-2.0
- Last commit
- 18 hours ago
GoActive
- Stars
- 26,986
- License
- MIT
- Last commit
- 1 day ago
TypeScriptActive
- Stars
- 20,392
- License
- —
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- 17 hours ago
PythonActive
- Stars
- 13,508
- License
- Apache-2.0
- Last commit
- 1 day ago
GoActive
- Stars
- 13,168
- License
- AGPL-3.0
- Last commit
- 16 hours ago
GoActive
Most starred project
33,180★
Open Source Identity and Access Management for Modern Applications
Recently updated
16 hours ago
ZITADEL provides a turnkey, API‑first identity solution with multi‑tenant management, OIDC, OAuth2, SAML, Passkeys, MFA, SCIM and unlimited audit, deployable via Docker, Kubernetes or SaaS.
What to evaluate
01Security and compliance
Assess support for industry-standard protocols, encryption at rest and in transit, multi-factor authentication, audit logging, and compliance certifications (e.g., GDPR, SOC 2).
02Scalability and performance
Evaluate how the platform handles concurrent authentication requests, supports clustering or horizontal scaling, and provides performance metrics or rate-limiting controls.
03Integration ecosystem
Consider the breadth of built-in connectors for directories, SaaS applications, social identity providers, and the availability of SDKs or webhooks for custom integrations.
04User experience and self-service
Look for customizable login flows, password-less options, self-service password reset, and user portals that reduce help-desk overhead.
05Extensibility and customization
Check whether the solution offers plugin architectures, scripting hooks, or API-first management that allow tailoring of policies, UI, and workflow logic.
Common capabilities
Most tools in this category support these baseline capabilities.
- OAuth 2.0 and OpenID Connect support
- SAML 2.0 integration
- Multi-factor authentication (MFA)
- User provisioning and lifecycle management
- Passwordless authentication methods
- Social login connectors (Google, Facebook, etc.)
- Admin console with role-based access control
- Audit logging and compliance reporting
- Customizable login UI and branding
- API-driven management and automation
- Session management and revocation
- Self-service password reset
Leading Identity & SSO SaaS platforms
Amazon Cognito
Customer identity and access management service for adding user sign-up, sign-in, and authentication to apps
Identity & SSO
Alternatives tracked
18 alternatives
Auth0
Cloud-based identity management platform for adding user authentication and authorization to applications
Identity & SSO
Alternatives tracked
18 alternatives
Clerk
User authentication and identity APIs for web and mobile apps
Identity & SSO
Alternatives tracked
18 alternatives
JumpCloud
Cloud directory platform for identity and device management
Identity & SSO
Alternatives tracked
18 alternatives
Okta
Identity and access management platform for workforce and customers
Identity & SSO
Alternatives tracked
18 alternatives
Stytch
User authentication APIs and SDKs
Identity & SSO
Alternatives tracked
18 alternatives
Most compared product
10+ open-source alternatives
Amazon Cognito is a cloud-based identity management service that enables developers to add user sign-up, sign-in, and access control to web and mobile applications. It provides a user directory, supports authentication standards (OAuth 2.0, OpenID Connect), and can federate identities from social and enterprise identity providers, simplifying the implementation of secure user authentication flows.
Leading hosted platforms
Frequently replaced when teams want private deployments and lower TCO.
Typical usage patterns
01Enterprise SSO across SaaS apps
Deploy the platform as a central IdP to provide employees with seamless access to cloud services like Office 365, Salesforce, and Slack using SAML or OIDC.
02Customer-facing authentication for web and mobile
Integrate the solution into public-facing applications to manage sign-up, login, social auth, and passwordless flows for end users.
03API authentication for microservices
Issue JWTs or opaque tokens that microservices validate, enabling stateless authentication and fine-grained authorization across distributed systems.
04Federated identity with external IdPs
Configure trust relationships with third-party identity providers (e.g., Azure AD, Google Workspace) to allow users to authenticate using existing corporate credentials.
05Passwordless login flows
Leverage email magic links, WebAuthn, or one-time codes to eliminate passwords while maintaining strong security guarantees.
Frequent questions
What is the difference between an open-source IdP and a commercial SaaS identity service?
Open-source IdPs are self-hosted, giving full control over data, customization, and cost, while SaaS services handle hosting, updates, and support but involve recurring fees and less direct access to underlying code.
Can I use an open-source SSO platform with existing LDAP or Active Directory directories?
Yes, most platforms include LDAP/AD connectors that synchronize users and groups, allowing the IdP to act as a bridge between legacy directories and modern protocols.
How do I choose between OAuth 2.0 and SAML for my applications?
OAuth 2.0 (often paired with OpenID Connect) is suited for modern web, mobile, and API scenarios, while SAML remains common for legacy enterprise applications that require browser-based SSO.
Is multi-factor authentication mandatory for compliance?
Many regulations (e.g., PCI DSS, NIST) recommend or require MFA for privileged access, but the exact requirement depends on the industry and the sensitivity of the data being protected.
What scalability considerations should I keep in mind when deploying an IdP?
Plan for high availability through clustering or load balancing, monitor token issuance rates, and ensure the underlying database can handle user and session volume growth.
Can I implement passwordless login with these platforms?
Most modern open-source IdPs provide passwordless options such as email magic links, WebAuthn, or one-time codes, which can be enabled through configuration or plugins.