Xceed.Products.Wpf.Toolkit.AvalonDock (nuget): AvalonDock is a docking windows control for WPF that lets you create customizable layouts using a full featured window docking system similar to what is found in many popular integrated development environements (IDEs) such as Visual Studio.  You can try this package for free for 45 days, after which you will need to purchase a license key to continue using it.
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