DockbarX - DockbarX is a standalone dock that groups and launches applications.
XWindows Dock - We've seen a lot of docks for Windows in our day, and they're usually not very good. We regarded XWindows Dock first with skepticism, then with guarded.
Gnome-Pie - Gnome-Pie is a circular application launcher for Linux.
RocketDock - RocketDock is a Mac OS X dock clone.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.
ObjectDock - ObjectDock is the most popular animated dock for Windows.