PyStopper is an Open Source practice tool designed to assist performers in dealing with the often forgotten third possibility in a performance-induced adrenal response; Freezing.
The application will change it's display from green to red pseudo-randomly, and the performer is directed to stop for the duration of the red. They then resume performing at the place that they left off when it turns green again.
The objective with this software was to acclimatize performers to stopping in random places in order to smooth out potential issues caused by freezing or forgetting your place in a performance.
Open Source Software
The code for PyStopper is available on my GitHub.