From version 1.5 onwards PsychoPy is distributed under the GNU GPLv3

The PsychoPy *library* includes the following:
    - pyparallel (http://pyserial.sourceforge.net/pyparallel.html). License: Python Software Foundation
    - quest (http://www.visionegg.org/Quest). License: BSD
    
The Standalone binary installers include a large number of additional packages, all with compatible licenses included (BSD, MIT, or GPL). These can be found in their respective site-packages directories.