The Gallio Automation Platform is an open, extensible, and neutral system for .NET that provides a common object model, runtime services and tools (such as test runners) that may be leveraged by any number of test frameworks.

http://gallio.org/

MbUnit is an extensible unit testing framework for the .NET Framework that takes in and goes beyond xUnit pattern testing. MbUnit is part of the Gallio bundle.

http://mbunit.com/

Please download the latest release from the Gallio Website.

Visit the Gallio Wiki to get the most comprehensive documentation about Gallio and MbUnit.