Wikipedia
OpenRasta is a development framework targeting the Microsoft .NET platform for building web-based applications and services, and distributed under an Open-Source MIT License.
By focusing development around resources and HTTP methods, OpenRasta simplifies the creation of ReST-friendly interfaces.
Developed to respect modern development practices, coming prepackaged with an inversion of control container, and enforcing the use of dependency injection throughout the framework, OpenRasta is a framework implementing an architectural pattern close to Model–View–Controller, called Resource–Codec–Handler.
OpenRasta also supports advanced HTTP features such as content negotiation, digest access authentication and full control of response codes sent back to a client.
Hosting of an application built on OpenRasta is available through ASP.NET, in-memory, in-process through Windows' HTTP APIs, or through any other environment able to receive HTTP requests, as the framework itself has no dependency on ASP.NET.