Dasher

A zooming text entry interface in which users write by navigating through a world of nested boxes, each labeled with a letter and sized proportionally to its probability under a language model. Users control navigation using any pointing device, including eye trackers, mice, or head trackers. Dasher is particularly significant as an assistive technology because it works well even with imprecise pointing, making it one of the fastest text entry methods available for eye-gaze input.