Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
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.
Winstep Nexus - The Winstep Nexus Dock is a FREE* professional dock for Windows. With Nexus, your most frequently used applications are only a mouse click away - and Nexus turns working with your computer into a fun and exciting experience.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
ObjectDock - ObjectDock is the most popular animated dock for Windows.