Top 20 NuGet owin Packages

Polyfills for future/draft elements of the OWIN standards for various server implementations
Owin middleware for create thumb images (https://github.com/lucasteles/Owin.ThumbCrop)
Nhibernate-based persistence layer for IdentityServer3
NFinal2 MVC framework
Wilcommerce Authentication and Authorization library
Helper library for writing API specs with OWIN and SpecFlow
Owin middleware to maintain sessions using cookies
User interface for managing groups, roles and permissions for the Owin Framework authorization middleware
Owin Framework authorization middleware that checks if the identity making the request has permission to do so and returns a 403 response if it does not
Autofac implementation for OWIN IoC container adapter
ASP.NET Web API adapter for OWIN IoC container adapter
Polyfill for Katana based server implementations (IIS and HttpListener)
Polyfill for Katana based server implementations (IIS and HttpListener)
Polyfills for future/draft elements of the OWIN standards for various server implementations
Falcor.NET server OWIN middleware for hosting a web-based Falcor datasource (router)
LINQ to OWIN is middleware that allows you to code your Katana/OWIN web applications as a set of reactive queries using Rx (Reactive Extensions) for .NET.
Patched version of Microsoft.Owin.Security.Cookies to backport https://github.com/aspnet/AspNetKatana/issues/58 into 3.0.1
OWIN middleware to support Jasig CAS Enhanced