WSO2 Identity Server is an open‑source IAM solution offering SSO, federation, adaptive authentication, and API security. Below is a curated list of 20 alternative SSO platforms—ranging from cloud‑native SaaS services to on‑prem open‑source products—each with a brief overview and a link to learn more.
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Enterprise‑grade identity cloud with universal directory, SSO, MFA, lifecycle management, and extensive app integrations.
Developer‑focused identity platform offering customizable login, social/social IDP federation, and robust rule‑based authentication flows.
Microsoft’s cloud identity service delivering SSO, conditional access, B2B/B2C capabilities, and deep integration with Office 365 and Azure services.
Secure cloud SSO and identity governance platform with adaptive MFA, directory integration, and a large app catalog.
Comprehensive identity suite offering PingOne SSO, PingFederate federation, and advanced risk‑based authentication for enterprises.
Open‑source identity and access management solution from Red Hat, providing SSO, LDAP/AD federation, social login, and fine‑grained authorization.
Enterprise IAM platform delivering SSO, adaptive authentication, identity gateway, and API security with extensive customization.
Formerly IBM Tivoli Access Manager, offering SSO, federation, risk‑based authentication, and API protection for large organizations.
Open‑source IAM suite supporting SSO, OpenID Connect, SAML, and UMA, with LDAP/AD integration and strong community support.
Cloud directory platform providing SSO, LDAP, RADIUS, and device management for hybrid environments.
Amazon’s user identity service offering SSO, social login, user pools, and fine‑grained access control for web and mobile apps.
Google Cloud’s identity solution delivering SSO via OpenID Connect, OAuth, and integration with G Suite/Workspace.
Versatile SSO suite supporting SAML, OAuth, OpenID Connect, and social login with extensive pre‑built integrations.
Developer‑centric identity platform offering SSO, JWT, passwordless login, and customizable UI with on‑prem or cloud deployment.
Identity provider focused on adaptive authentication, risk‑based MFA, and SSO for enterprise applications.
Zero‑trust MFA and SSO solution that integrates with existing IdPs and provides contextual access policies.
Privileged access management platform with SSO, MFA, and session monitoring for cloud and on‑prem resources.
Open‑source identity platform offering SSO, passwordless login, and multi‑tenant support with a focus on privacy.
Mature open‑source SAML IdP widely used in academia and research for federated SSO across institutions.
Open‑source OAuth2 & OpenID Connect server that can act as an SSO provider when combined with Ory Kratos for user management.