我所知道的Ribbon库

QT：

http://www.devmachines.com/qtitanribbon-overview.html

http://qribbon.sourceforge.net

MFC、c#可以到微软官方下载

System.Windows.Forms.Ribbon35.DLL 
- Type: Managed DLL 
- An Open Source Ribbon Control for .NET WinForm 
- Read more: http://officeribbon.codeplex.com,