OSWeb lets you run an OpenSesame experiment on a browser. OpenSesame is a pretty neat program to create experiments for psychology, neuroscience, and experimental economics. You can get very far with drag-and-drop, and there’s the chance to add code snippets if you need more flexibility.
OSWeb’s documentation is far better than ours could ever be. So, here, we just point out that combining OSWeb with JATOS is pretty easy and straightforward: just export the experiment in OSWeb and import it in JATOS.
That’s all there is to say. If you’d like to know more, Sebastiaan Mathot’s tutorial is the place to start.