IdentityServer released IdentityServer4 RC1 on September 6, 2016 on NuGet to support .NET Core and ASP.NET Core.
This will streamline the authentication to a lot of the .NET Core web api and web applications.
For more info, please take a look at the overview blog article here.
Here’s the highlight from the post:
Centralized login logic and workflow for all of your applications (web, native, mobile, services and SPAs).Single Sign-on / Sign-out
Single sign-on (and out) over multiple application types.
Access Control for APIs
Issue access tokens for APIs for various types of clients, e.g. server to server, web applications, SPAs and native/mobile apps.
Federation GatewaySupport for external identity providers like Azure Active Directory, Google, Facebook etc. This shields your applications from the details of how to connect to these external providers.
Focus on Customization
The most important part – many aspects of IdentityServer can be customized to fit your needs. Since IdentityServer is a framework and not a boxed product or a SaaS, you can write code to adapt the system the way it makes sense for your scenarios.
Source: Introducing IdentityServer4 for authentication and access control in ASP.NET Core