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IdentityServer
The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core
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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.
You have unfortunate timing as Duende is playing licensing whack-a-mole this week. See yesterday's commit on the offending repository: https://github.com/IdentityServer/IdentityServer4/commit/534e6c1c5e61fcd5037d15c9f33498eb0bbc5c92 along with https://github.com/IdentityServer/IdentityServer4/commit/019e1cb44567acbe18c7fc56f2a10b3e8f2b540f
That repository is now (effectively) dead and the new home is over at https://github.com/DuendeSoftware/IdentityServer along with their new license. Here's a recent discussion on the change: https://old.reddit.com/r/dotnet/comments/s1bplx/duende_moves_to_a_new_fair_trade_license_lifting/
Short answer: IdentityServer is no longer FOSS, so if that's critical, consider using https://github.com/openiddict/openiddict-core. Not as turn-key, but you'll see in their readme that OrchardCore has a bit more bells-and-whistles implementation that might appeal. Both projects are also FOSS with standard open-source licenses.