As from today you can download an alpha of NCLDR (see http://www.ncldr.com).
NCLDR is an open source port of CLDR to the .NET Framework. CLDR is the Common Locale Data Repository, a considerable database of culture data maintained by the Unicode Consortium and used by the rest of the non-Microsoft developer community. As such CLDR is analogous to the System.Globalization namespace in the .NET Framework with the difference that CLDR has nearly twice the number of cultures and has solutions for globalization and localization problems that the .NET Framework does not. NCLDR brings these cultures and these solutions to the .NET Framework.
There are a number of short videos on the NCLDR website that will help you get up to speed. The source code is on GitHub. There is also a NuGet package (search for pre-release packages).
Clearly this is an alpha release and it illustrates the potential of such a port but it isn't finished yet by a long way and I am looking for feedback of any kind on this project.