7+ Taskbar Tweaker - 7+ Taskbar Tweaker allows you to configure various aspects of the Windows taskbar.
Cairo-Dock - Cairo-Dock / GLX-Dock 3. 4 is now available. Cairo-Dock 3. 4 is finally released! One year after the 3.
TaskbarX - TaskbarX gives you control over the position of your taskbar icons.
RocketDock - RocketDock is a Mac OS X dock clone.
TranslucentTB - TranslucentTB make Windows Taskbar transparent
Dash to Dock - Gnome shell extension to position overview dashboard as a desktop launcher.