Top 20 NuGet owin Packages

Sunpoin.Owin.Wrapper
Command-line tools for DotVVM.
Okanshi support for OWIN
A .NET implementation of OWIN middleware for LTI
Polyfills for future/draft elements of the OWIN standards for various server implementations
Owin Middleware to generate WebApi help pages without dependencies on MVC or System.Web. Great for self hosted WebApi. Razor is used for the documentation templates to make it easy to customize. Based on Yao's example http://goo.gl/0YMkKq
Unified OAuth provider for Microsoft work, school, and personal accounts to be used with ASP.NET 4.5 OWIN
An NTLM authentication middleware for OWIN that enables you to use NTLM (Windows) Authentication independently of IIS or HTTPListener. Furthermore it integrates with ASP.NET Identity 2.0 and allows you to have NTLM as yet another mean of authentication toghether with true local application accounts...
.NET library with simple routing inspired by express.js for Katana applications.
.NET library with IMS LTI support for Tool Consumer and Tool Provider applications. Supports IMS LTI 1.0, 1.1, 1.1.1 and 1.2; Outcomes 1.0; Outcomes 2.0 (Draft); and Content-Item Message 1.0.
HTTP compression OWIN middleware
Owin Middleware it is possible to RequestScopeContext like HttpContext.Current but no dependent System.Web.
Adds additional OAuth providers for OWIN to use with ASP.NET
Adds additional OAuth providers for OWIN to use with ASP.NET
Adds additional OAuth providers for OWIN to use with ASP.NET
Adds additional OAuth providers for OWIN to use with ASP.NET
Adds additional OAuth providers for OWIN to use with ASP.NET
Adds additional OAuth providers for OWIN to use with ASP.NET
Implements the sphyrnidae security model over OWIN (OAuth authentication/authorization)
Common library for NFinal MVC.