A SCIM Connector is a middleman between an application and any SCIM-compliant identity providers (IdPs), such as Okta and Microsoft Entra. It simplifies the integration process by centralizing connections, normalizing data across multiple providers, and handling SCIM requests at scale. Three top SCIM connectors to consider are WorkOS, Frontegg, and Stytch. These connectors offer various features like Events API, self-service provisioning capability, and comprehensive authentication services. The choice of a SCIM connector depends on factors such as the current authentication stack, budget, scalability needs, and desired customer onboarding experience.