You can download Krita , Krita brushes and Krita animation.
Krita is a free and open source application. You are FREE to study, modify, and distribute Krita.
The Krita project was started by the KDE community in 1998. Krita is still part of the KDE community: all Krita contributors are KDE community members! KDE is an international community working together to create free and open source software for users all over the world.
Besides the obvious requirement of having an eye tracker device, you will also need a control program that will let you interact with the device. When you obtain the device, such a program will most probably be provided to you but that program might not be sufficient for using the device with Krita.
Basically, setting the control program to left double click mode and dwelling on the Krita icon on the desktop would be enough to start up Krita but there are some issues with this:
On startup, Krita asks you to choose a template. It’s likely that you don’t want to go through this setting every time and just want to start with a blank template.
Later, saving the document will require interacting with the file save dialog which is not very friendly for this type of use.
A workaround for these issues could be creating and saving a blank template and running a script that will copy this template under a new name and send it to Krita. Here’s an example script for Windows which uses a timestamp suffix to make sure that each file will have a different name (replace USERNAME with the actual user name):