Looking for open audio resources I've found Freesound.org where I was able to get some very nice sounds to use

Another resource I've learned of in this course is the Open Economics organization, and what I really appreciated is not only the accessibility to very interesting data and research, but the clear way in which they're presented

The directory of open access journal  http://doaj.org I found out in this course is a precious mine of hight quality research works and I found some very useful articles in this library