Top 20 NuGet owin Packages

A Nowin server wrapper for Simple.Owin
A simple tcp socket based server for Simple.Owin
ASP.Net identity utilities for Azure
ASP.NET MVC5 ships with a few default OAuth Providers e.g. Facebook and Google. This is a Fitbit extension for the default OAuth provider list. It is important to note that like all OAuth provider, the identity of the signed up user with the OAuth provider may or may not have been verified.
An Angular starter kit with authentication (ASP.NET Identity 2.1.0). To get started create a new empty web application, then install the package. To use build and run the application then navigate to http://your-url/spa. For more information please see the wiki on the project site.
Authorization Server for OWIN
OWIN hosting for OpenRasta
Microsoft.AspNet.WebApi with Owin Bootstrapper for .NET web projects
Easily hand out JSON Web Tokens using a REST API accepting username/password.
Cormo module that sets up a ready-to-go OWIN web-api project fully-configured with Contexts and Dependency Injection and other Cormo goodness, with zero fuss and zero-config
OWIN hosting for OpenRasta v2 by Just-Eat
Pandexio Owin components for .Net
Exira.EventStore.Owin is an OWIN middleware to keep an EventStore connection shared per application
Quantum Identity is an OWIN Middleware component for tracking anonymous users in ASP.Net web applications.
Quantum Identity is an OWIN Middleware component for tracking anonymous users in ASP.Net web applications.
Exira.VersionHeader.Owin is an OWIN middleware to add assembly version information to HTTP headers
Basic Authentication Middleware