Nancy is a lightweight, open-source web framework for .NET. In the spirit of Sinatra for Ruby, Nancy provides just the essentials necessary to implement web applications with minimal extraneous code. Because the framework is independent of any particular hosting environment, the developer is freed from the IIS and ASP.NET environment. This makes Nancy an excellent complement to OWIN and compatible with other OWIN modules. We are really happy to see the emergence of lightweight web frameworks in a number of other languages as well; Spark for Java, Flask for Python, etc..