OpenGazer is described as 'Opengazer is an open source application that uses an ordinary webcam to estimate the direction of your gaze. This information can then be passed to other applications' and is an app in the Development category. There are four alternatives to OpenGazer for Windows and Linux. The best alternative is Enable Viacam, which is both free and Open Source. Other great apps like OpenGazer are camera mouse (Free), GiMeSpace Cam Control (Free) and EagleEyes (Free).
Enable Viacam (aka eViacam) is an open source mouse replacement software that moves the pointer as you move your head. It works on standard PCs equipped with a web camera. No additional hardware is required. Based on the award winning Facial Mouse software.
EagleEyes is a technology that allows the user to move the cursor on the screen of a Windows computer by moving his or her eyes or head. Basically, the cursor follows the location that the user is looking at on the screen. The eyes replace the mouse.