PsychoPy is an open-source application to allow the presentation of stimuli and collection of data for a wide range of neuroscience, psychology and psychophysics experiments. It’s a free, powerful alternative to Presentation™ or e-Prime™, written in Python (a free alternative to Matlab™ ).
Latest version: 1.82.01 was released Feb 2015. See the full Changelog
See complete Changelog for complete list of additions and fixes