Eyetwig provides a practical, friendly, low-cost system for controlling personal computers without the use of hands. The technology behind the system, which requires no special hardware, is based on the real-time identification and tracking of objects. Thus, the system enables the operation of computers by identifying and tracking the movements of the user's head only.
Tracker trial has all the functionality of the Tracker Pro, with some limitations, and it is limited to seven days. During this time you can evaluate the product and see if it meets your expectations.
Please note that in order to use the speech recognition engine you muse have the Microsoft Speech API installed. If you are using WinXP you do not need to install it.