wm/piewm 1.04 NetBSD

Although the computer screen is two-dimensional, today most users of windowing environments control their systems with a one-dimensional list of choices -- the standard pull-down or drop-down menus such as those found on Microsoft Windows, Presentation Manager, or the Macintosh.

An alternative user-interface technique is "pie" menus - two-dimensional, circular, and in many ways easier to use and faster than conventional linear menus. Pie menus also work well with alternative pointing devices such as those found in stylus or pen-based systems.

piewm is a virtual window manager based on tvtwm, which uses pie menus.