Slingscold!

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The idea behind Circle Dock is that the dock should appear where your mouse is instead of you having to move your mouse to the dock like with other programs. This is accomplished by making the dock a circular or spiral shape so that it can be placed anywhere, even near the edge of the screen. The offscreen portions of the dock are easily reached by just scrolling with your mouse wheel or arrow keys.

Gnome-Pie is a circular application launcher for Linux. It is made of several pies, each consisting of multiple slices. The user presses a key stroke which opens the desired pie. By activating one of its slices, applications may be launched, key presses may be simulated or files can be opened. The user does not need to remember the name of an application – just the direction has to be remembered.

Slingshot is the lightweight and stylish app launcher designed for elementary OS .

Launch Box is generally an application launcher. It's very influenced by Quicksilver for Mac OSX. Remember that this is only a first release so don't get your hopes up too much. Launch Box is written for the GNOME 2.10 platform and depends on GTK+ 2.6, evolution-data-server 1.2 and gnome-menus. These are currently hard dependencies but the plan is to split out the backends into different optional backends.