You could have downloaded PyEPL 1.1 for Mac from our software library for free. This free software for Mac OS X is a product of Aaron Geller & Per B. Sederberg. Our built-in antivirus checked this Mac download and rated it as virus free. The application is included in Education Tools.
From the developer:
PyEPL (the Python Experiment-Programming Library) is a library for coding psychology experiments in Python. It supports presentation of both visual and auditory stimuli and supports both manual (keyboard/joystick) and sound (microphone) input as responses.
You may want to check out more software for Mac, such as sciatrope, Analytics to Earth or TreeView X, which might be similar to PyEPL.