FusionAuth Identity Engine

Open-source and commercial identity and access management platform for modern applications. FusionAuth provides user registration, authentication, and authorization features. Supports OAuth2, SAML, OpenID Connect protocols. Multi-tenancy support for SaaS applications. Passwordless authentication options. Lambda functions for custom code execution. Webhooks for extensibility and integration. User migration tools for switching from other systems. Simple REST API for integrations. Open-source version available for self-hosting. Best for developers wanting control over their identity platform.

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