RocketDock - RocketDock is a Mac OS X dock clone.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
ObjectDock - ObjectDock is the most popular animated dock for Windows.
Gnome-Pie - Gnome-Pie is a circular application launcher for Linux.
Cairo-Dock - Cairo-Dock / GLX-Dock 3. 4 is now available. Cairo-Dock 3. 4 is finally released! One year after the 3.
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.