OpenSesame is a tool to create experiments for psychology, neuroscience, and behavioral economics. OpenSesame provides an easy to use, point-and-click interface for implementing protocols and collecting data..

Mathôt, S., Schreij, D., & Theeuwes, J. (2012). OpenSesame: An open-source, graphical experiment builder for the social sciences. Behavior Research Methods, 44(2), 314-324. doi:10.3758/s13428-011-0168-7

OSWeb is an online runtime for OpenSesame experiments. OSWeb integrates OpenSesame's open-source code with a javascript library to implement the GUI in a web environment.

• A comprehensive graphical user interface--flexible and easy-to-use
• Support for Python scripting--add the power of Python to your experiment
• Support for external devices--use your eye tracker, button box, EEG equipment, etc.
• Free and open source--released under the GPL3
• Crossplatform--runs on Windows, Mac OS, Linux, and Android (runtime only)

For more information, see: http://osdoc.cogsci.nl/