openiddict-core VS IdentityServer4.Admin

Openiddict is also an option. Check it out.https://github.com/openiddict/openiddict-core

To implement an OAuth server together with OpenID connect specification, I used a free and open source framework called Openiddict. You should checkout their GitHub repository at github.com/openiddict/openiddict-core. It is a nice and feature rich tool which help you get started very fast. However, comparing to alternatives like identity server, it needs more implementation rather functionalities coming out of the box.

You can use Openidict https://documentation.openiddict.com/, give it a try

Openiddict to create your own OpenID Connect server if you want to deep dive into auth https://github.com/openiddict/openiddict-core

If you do want a .NET IdP then you could look into OpenIddict but will require some hands on work, at a minimum authorisation controllers. If you're looking for something more out of the box OrchardCore's OpenId module might be better for you.

I personally prefer using Cookies with openiddict.

Also, the OAuth bit is very cool!! Do you plan to support OpenIddict it’s a free federated identity server.

Okta is a great example of an IdP, although there are many others. Auth0, Ping Federate, Amazon cognito, etc. OP also mentioned Identity Server, which is a framework for implementing your own IdP. I've also personally used an open-source library called [OpenIDDict[(https://documentation.openiddict.com/) to great success. I would highly recommend attempting to implement one of these providers as a learning exercise.

Yep, this is a quite decent one: https://github.com/skoruba/IdentityServer4.Admin

Are there any good ready to deploy implementations of version 5.0 ( btw v6 was released 10 mins before this comment). What I mean is with full UI, Admin etc like this one https://github.com/skoruba/IdentityServer4.Admin

Obviously, since it was cheaper to have a whole team dedicated to running ID5 (duende), when just spun up that combined with an open source admin ui from https://github.com/skoruba/IdentityServer4.Admin

I tested out https://github.com/mguinness/IdentityManagerUI which is simple and works for my current needs. https://github.com/skoruba/IdentityServer4.Admin was the only alternative I found, assuming it works without IdentityServer4. It seems a bit heavier but also has more development behind it.