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ASP.NET Core
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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blazor-starter-kit
Clean Architecture Template for Blazor WebAssembly Built with MudBlazor Components.
DotNetBoilerplate might suit your needs. They also have a more advanced commercial offering
So I would look at https://orchardcore.net/ or https://www.oqtane.org/#home. Both are asp.net core, multiple DB support, open source, and have admin pages for user/role management. Oqtane uses Blazor for UI.
This might help? https://github.com/blazorhero/CleanArchitecture