What is "openfmri"

OpenfMRI is an open-science neuroinformatics database storing datasets from task-based functional magnetic resonance imaging (fMRI) research studies. The database is available online from http://www.openfmri.org. Neuroimaging researchers, having performed an fMRI study, may upload their neuroimaging data to the site. Third-party researchers may download the data and use it, e.g., for re-analysis.

OpenfMRI are predated by two other online neuroimaging databases: fMRI Data Center (fMRIDC) and 1000 Functional Connectomes Project (FCP). fMRIDC collected that same type of fMRI data as OpenfMRI but provided data via physical media and the site no longer accepts data submission. FCP collected data from resting-state fMRI studies.

OpenfMRI is run by the research group around Russell Poldrack, and they described the system in the scientific article Toward open sharing of task-based fMRI data: the OpenfMRI project from 2013.