scim
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Frontegg
Frontegg is a customer identity and access management (CIAM) platform that gives SaaS builders drop-in authentication, authorization, and user management so they don't have to build login, SSO, MFA, roles, and multi-tenancy from scratch. Founded in 2019 by two former Check Point engineers, the company has expanded from B2B user management into identity infrastructure for AI agents, launching Frontegg.ai and AgentLink to secure how AI systems and the Model Context Protocol access enterprise applications.
ZITADEL
ZITADEL is an open-source identity and access management platform that gives developers enterprise-grade authentication and authorization without vendor lock-in. Built in Go with an API-first design and native multi-tenancy, it supports OAuth2, OpenID Connect, SAML, SCIM, passkeys, MFA and self-service flows, and can run as a self-hosted deployment or as a managed cloud service. Founded in Switzerland in 2019 and now remote-first, ZITADEL aims to make identity a foundational piece of infrastructure - like a database or a web server - rather than a barrier to shipping software.