BCGControlBar Library for .NET is 100% managed code toolkit written in C++/CLI and targets Microsoft .NET Framework version 2.0 or higher. The library contains a number of highly customizable, fully designable components that enable you to create the most sophisticated user interface.

The highlighted features are:

Office 2007/2010/2013/2016-style ribbons
Fully-customizable VS/Office-style toolbars and menus
Visual Studio-like Docking Panes
MDI tabs
Flexible visualization managers
Advanced Grid control
Gauges
Lot of advanced controls
and even more...

Product information:
http://www.bcgsoft.com/bcgcontrolbardotnet.htm

Download fully functional 30-day trial version here:
http://www.bcgsoft.com/bcgcontrolbardotnet-download.htm