Radian is described by its author as
Radian is a simple radial application launcher
When Radian is launched it starts with what it calls design mode, which is also accessible any time by right clicking or double clicking its system tray icon. This startup briefly slows the system while the program searches and indexes its pre-configured shortcuts, described below. In design mode Radian’s circular or radial interface is divided into 4 quadrants (see image). Each quadrant can be configured, using its corresponding wheel icon residing near the center of the circle, to hold chosen shortcuts and their respective icons. Three of the four quadrants are pre-configured to show desktop items, quick launch items and the recent documents entries. The fourth quadrant is called custom and any file or shortcut can be dragged to any of its regions. Right clicking on any of the individual regions also allows for the creation of custom shortcuts.
After design mode is done Radian stays in the tray and can be activated by clicking and holding down the right click button any where on the screen. Then the second, third or fourth quadrants can then be made visible by moving the mouse in a circular fashion while still holding down the right click button.
Radian is one launcher that certainly needs getting used to but it is a different and original looking download.