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IdentityServer
The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core
I would not recommend it. There is a server named Duende identity server which you can host locally.
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Thought I would just mention https://supabase.com, the project is heavily inspired by firebase but allow for self hosting etc.
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Appwrite
Appwrite - The Open Source Firebase alternative introduces iOS support . Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.