Top 20 NuGet owin Packages

The TradeMe OAuth provider OWIN middleware
Simple static file middleware for owin.
IdentityServer3 - Cache.Redis is a library that includes the implementation for client, scope, and user stores using Redis as distribuited cache system.
LightNode(as Micro REST/RPC Framework) Formatter for JSON by Jil.
LightNode(as Micro REST/RPC Framework) Profiler for Glimpse.
A Plugin for OwinFriendlyExceptions to handle WebApi2
A Trello OAuth provider for OWIN to use with ASP.NET
Middlewares to help secure your apps
Aes data protection provider for Microsoft.Owin.Security.
A library for Microsoft.Owin app with Razor views
Swagger integration for LightNode(as Micro REST/RPC Framework).
EmbedIO can use the OWIN platform in two different approach: You can use EmbedIO as OWIN server and use all OWIN framework with EmbedIO modules. or You can use OWIN Middleware into EmbedIO as a module.
Owin middleware for emulate modRewrite
(Just depend on .NET 4.0,not .NET 4.5) Fast Owin Web server in pure .Net without reliance on HttpListener or Win8, includes WebSockets and SSL support
Provides a stand-alone executable (OwinHostForHeroku.exe) which can be used to host an OWIN-based application on Heroku.
Role Provider middleware for Owin
Another Owin implementation which serves static files in a very thin manner. It is inspired from Microsoft.Owin.StaticFiles.
Allows you to create a lightweight owin server with basic endpoints
This library provides an OWIN Middleware for authenticating users based on the Belgium eID identity cards. Based on the data that can be read from the client certificate, it will create a ClaimsIdentity for use in your web applications.