PsychoPy is an open-source package for running experiments in Python (a real and free alternative to Matlab). PsychoPy combines the graphical strengths of OpenGL with the easy Python syntax to give scientists a free and simple stimulus presentation and control package. It is used by many labs worldwide for psychophysics, cognitive neuroscience and experimental psychology.

Because it's open source, you can download it and modify the package if you don't like it. And if you make changes that others might use then please consider giving them back to the community via the mailing list. PsychoPy has been written and provided to you absolutely for free. For it to get better it needs as much input from everyone as possible.

PsychoPy Features:
1. Simple install process
2. Huge variety of stimuli (see screenshots) generated in real-time:
* linear gratings, bitmaps constantly updating
* radial gratings
* random dots
* movies (DivX, mov, mpg...)
* text (unicode in any truetype font)
* shapes
* sounds (tones, numpy arrays, wav, ogg...)

3. Platform independent - run the same script on Win, OS X or Linux
4. Flexible stimulus units (degrees, cm, or pixels)
5. Coder interface for those that like to program
6. Builder interface for those that don't
7. Input from keyboard, mouse or button boxes
8. Multi-monitor support
9. Automated monitor calibration (requires PR650 or Minolta LS110)

PsychoPy has three main components; the application Coder view, the Builder view and an underlying API programming library.

The license of this software is Free, you can free download and free use this application software.