NOTE: This list of data repositories will link to collections of datasets that range from in-progress to completed research projects, with researcher-contributed data. These datasets may or may not be of use, but give a sense of the breadth of data available.

Dryad: a nonprofit repository for data underlying the international scientific and medical literature.
http://www.datadryad.org/

FigShare: a repository where users can make all of their research outputs available in a citable, shareable and discoverable manner
https://figshare.com/

Open Science Framework: a scholarly commons to connect the entire research cycle
https://osf.io/

More data repositories listed on the Open Access Directory at http://oad.simmons.edu/oadwiki/Data_repositories.