PsychoPy

An open‐source application written in Python for creating experiments in behavioral sciences, including psychology and neuroscience. PsychoPy offers both a graphical Builder interface and a script‑based coder view, enabling researchers to design reaction‑time tasks, psychophysical experiments, and eye‑tracking studies without licensing fees. PsychoPy allows researchers and students to design and run experiments easily, with a focus on flexibility and customization.