Welcome to Dragablz. Dragablz is an open source Chrome style draggable & tearable tab for WPF.  Dragablz also makes user friendly docking and tool windows achievable very quickly.

Shown here using the Material Design in XAML Toolkit Theme:

• Source code can be found on GitHub here: http://github.com/ButchersBoy/Dragablz
• NuGet package cound be found here: http://www.nuget.org/packages/Dragablz/
• To get started see here: Getting Started With Dragablz
• Demo project in the GitHub solution
• .net 4.0 & .net 4.5 builds included in the NuGet package
• Supports MVVM
• Fully themeable (supports Material Design in XAML Toolkit and MahApps)
• Ping the developer on twitter! @james_willock

Simple XAML:

<dragablz:TabablzControl Margin="8">
<dragablz:TabablzControl.InterTabController>
<dragablz:InterTabController />
</dragablz:TabablzControl.InterTabController>
<TabItem Header="Tab No. 1" IsSelected="True">
<TextBlock>Hello World</TextBlock>
</TabItem>
<TabItem Header="Tab No. 2">
<TextBlock>We Have Tearable Tabs!</TextBlock>
</TabItem>
</dragablz:TabablzControl>

Classic Trapezoid Tabs:

 Simple, User Friendly Layout System:

User friendly docking.