Frontegg

FusionAuth

FusionAuth provides a complete customer identity and access management solution that developers can integrate quickly via APIs, SDKs, and webhooks. It handles authentication, authorization, and user lifecycle management while offering both cloud SaaS and self‑hosted deployments. The platform includes built‑in support for social logins, multi‑factor authentication, passwordless flows, and fine‑grained role‑based access control, making it suitable for everything from startups to large enterprises.

Descope

Descope is a customer identity and access management (CIAM) platform that handles authentication and authorization for consumers, business customers, partners, and increasingly AI agents and MCP servers. It provides a no-code, drag-and-drop workflow builder for creating signup, login, MFA, and SSO flows without hand-rolling authentication logic. The platform supports a wide range of authentication methods including magic links, passkeys, social login, one-time passwords, SAML/OIDC SSO, and FIDO2, plus fine-grained authorization models like RBAC, ReBAC, and ABAC. Descope ships SDKs for major frontend and backend frameworks and offers identity orchestration that syncs with more than 50 third-party tools.

authentik

Authentik is an open-source authentication server that provides a comprehensive solution for identity and access management. It offers a wide range of features, including multi-factor authentication, single sign-on, and user management.