OpenSesame

OpenSesame is a program to create experiments for psychology, neuroscience, and experimental economics. The latest stable version is 3.3.9 Lentiform Loewenfeld, released on April 10, 2021 (release notes).

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Features

A user-friendly interface — flexible yet easy-to-use
Includes Rapunzel, a standalone code editor for numerical computing
Python — add the power of Python to your experiment
Use your devices — use your eye tracker, button box, EEG equipment, and more.
Free — released under the GPL3
Crossplatform — Windows, Mac OS, Linux, and Android (runtime only)
Run your experiments online

Citation

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