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.
Fences - Keep your desktop organized with Fences. This is a simple software program that allows you to sort the tabs on your desktop and create files that are easily recognizable to you.
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.
Gnome Do - Simple, sleek, swift, smart. Do. GNOME Do allows you to quickly search for many items present on your desktop or the web, and perform useful actions on those items. GNOME Do is inspired by Quicksilver & GNOME Launch Box.