Para.wiki has the Experiment namespace for hosting user-run experiments about the paranormal. In addition to all the normal wiki features, the Experiment namespace supports subpages, which allow an experiment to take up multiple pages, allowing for a clean separation of the project description, datasets, research.
Note that the experiment namespace is only for user-run projects. Paranormal experiments like the Philadelphia experiment should be in the main namespace.
To start an experiment, simply navigate to a page with a title like Experiment:experiment_title and create/edit like any other page.
To browse experiments, see Special:AllPages