I am looking for a fully free open source .NET software for identity and access management, featuring SSO, multitenancy, user management, permissions, roles, clients, scopes, etc., with native support for SQLServer and ORACLE. It should have a user interface so that I can simply point my configuration to that authorization server.

I have ruled out IdentityServer4 and earlier versions because they are no longer maintained, and their latest version is owned by Duende Software, which is paid.

I also discarded SimpleIdServer because, upon testing it, I found it to be not very robust and user-friendly. Additionally, I am wary as it seems to be maintained by an individual rather than a dedicated company.

Essentially, I need to know if there is something like Keycloak or WSO2 but developed in .NET.

Thank you.