1)   LidorSystems.Collector 1.5
LidorSystems.Collector is the most comprehensive .NET class library for designing complex application workspaces with docking and floating tool windows, tabs and tabbed MDI documents. Emulates visual styles like VS 2005, VS 2003, Office 2003, WinXP.
bar, collect, collector, component, design, docking, floating, form, forms, layout,

 2)   Docking control 1.0.2
JaStDev's Docking control is a component library for WPF that helps you build complex Tabbed document interfaces.
Docking Control, WPF, docking, dockingcontrol, tabbed document interface, tdi, drag, drop, collaps, control,