The Eyeharp
The EyeHarp is a gaze-controlled or head-controlled music interface. It aims to allow people with physical disabilities learn and play music. It is open source and free to download and use. It has been developed by Zacharias Vamvakousis, researcher in the Music and Machine Learning Lab, Pompeu Fabra University, Barcelona, Spain. It is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
A more detailed description of the software, including an installation manual is available in the following link: