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YetAnotherForum Web Hosting - 2010
What’s YetAnotherForum?
YetAnotherForum(YAF) is an 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.
YAF Features:

100% C# ASP.NET
Microsoft SQL Server 2000/2005 database [...]