RocketDock is an application launcher.

AquaSnap is a powerful window manager that helps you arrange and organize multiple applications on your desktop with minimum effort.

Winstep Nexus Dock is a free professional dock for Windows. With Nexus, your most frequently used applications are only a mouse click away.

Circle Dock is a circular, oval, and spiral dock for Windows.

ObjectDock is a dock similar to that in the Aqua GUI. It is distributed by Stardock for Windows.

7stacks helps you group icons into stacks on your Windows 7 taskbar.

Appetizer is a free application launcher, or dock, for Windows. It allows organizing your shortcuts and folders into a convenient dock.

XWindows Dock was a clone of the dock in Mac OS X Leopard for Windows.