Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
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.
RocketDock - RocketDock is a Mac OS X dock clone.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
Dash to Dock - Gnome shell extension to position overview dashboard as a desktop launcher.