Portoa is a convenience library/framework for creating and managing an ASP.NET MVC application that uses Unity and NHibernate (NHibernate is optional, Unity is kind of required).
Basically, it wires everything up (e.g. ControllerFactory, the Unity Container, etc.) so that you don't have to. It also provides some other utilities, like JSON parsing (default implementation uses Json.NET), logging interfaces (default implementation is log4net), searching using Lucene.NET, and lot of easy-to-use ASP.NET MVC support (custom model binders and such)