Take a look at this journal - it is dedicated to the scientific study of what is today's most urgent topic (sustainability), approaches it from a cross-disciplinary perspective and in a way that stimulates collaboration between scientific generations, and is most appropriately (and ambitiously) named Consilience:
http://consiliencejournal.readux.org/ (full name: Consilience: The Journal of Sustainable Development).

As any ordinary journal, Consilience will accept research papers, but like Eduzendium, it will also accept manuscripts written for coursework.

Finally, it is entirely Open Access.