Apps similar to Paradigm include OpenSesame, which is free and open source. Other options are PsychoPy and SuperLab. In total there are three Presentation Makers like Paradigm for Mac, Windows, Linux and Android.
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...
PsychoPy is an open source software package, written in Python programming language, for the generation of experiments for neuroscience and experimental psychology.Unlike most packages it provides users with a choice of interface; generate experiments by writing Python scripts...
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SuperLab 4 is the stimulus presentation software for Mac OS X (10.4 or later) and Windows 7/Vista/XP. In development for almost five years, the new SuperLab 4 introduces a host of new features, including:
