OpenSesame

OpenSesame is a graphical, open-source experiment builder for the social sciences. It sports a modern and intuitive user interface that allows you to build complex experiments with a minimum of effort.

With OpenSesame you can create a wide range of experiments: Psychophysics, reaction time tasks, and questionnaires, to name but a few. The plug-in framework and Python scripting allow you to incorporate external devices, such as eye trackers, response boxes, and parallel port devices, into your experiment.