Yet Another Forum.NET 1.9.1
YetAnotherForum.NET (YAF) is a Open Source discussion forum or bulletin board system for web sites running ASP.NET. The latest version is ASP.NET v2.0 with a Microsoft SQL Server backend. The full C# source code is available licensed as GPL.
YetAnotherForum.NET has modules allows it to be used in either DotNetNuke or Rainbow.