PEBL (Psychology Experiment Building Language) is an open source software program created by Shane T. Mueller that allows researchers to design and run psychological experiments.

It runs on PCs using Windows, OS X, and Linux, using the cross-platform Simple DirectMedia Library (libSDL).

PEBL is a programming language that allows users to create experiments by editing text files.

][3] PEBL supports presenting stimuli via text, images, movies, audio files; allows response collection via keypress, mouse, joystick, and specialized hardware devices; and supports a number of networking and communication protocols.

[citation needed] The PEBL system and related files have been downloaded more than 100,000 times.