Top 20 NuGet owin Packages

Provides a default starting point for setting up a new JWT OAuth server which includes Its.Configuration and Its.Log with a set of classes that preconfigure numerous defaults. All you have to do is provide service setup and your actual authentication (one method implementation).
Native login throttling middleware for OpenIdConnect (IdentityServer)
An easy to use OAuth 2 authentication provider for ASP.NET MVC5 and OWIN.
Provides Application Insights request and error tracking for both ASP.Net MVC and Web API using OWIN running on IIS.
Web Application Framework
Owin Basic Authentication
NFinal2 MVC framework.Kestrel Server.
Extends the WebApi integration with SignalR support.
Create self hosted OWIN http server in scriptcs
IdentityAdmin.EntityFramework is a persistence layer for IdentityAdmin configuration data that uses EntityFramework as it's database abstraction.
IdentityServer3 Access Token Validation Integration Library for ASP.NET 5
Extends the App.Metrics library providing a set OWIN Middleware Components and Web Api extensions which will record things like error rates per endpoint and an overall rate, request rates per endpoint and an overall rate etc.
Extends the App.Metrics library providing a set OWIN Middleware Components and MVC extensions which will record things like error rates per endpoint and an overall rate, request rates per endpoint and an overall rate etc.
Redis cache for dependency injection service.
Json.net json serializer for dependency injection service
Razor template for dependency injection service
Nustache template for dependency injection service
JNTemplate template for dependency injection service
ProtobufSerialize serializer for dependency injection service
A simple orm for easy insert and update.