Mendeley and Zotero are freely available citation managers that are recommended by Moon Library librarians. Either of these tools will allow you to save, store, and organize citations and pdfs, create bibliographies, and much more. Please see this guide for more information: http://libguides.esf.edu/c.php?g=468074&p=3200495.
We also have workshops throughout the semester on using these citation managers. Please contact us for more information. 
If you are considering publishing an article in an open access journal, or if you do research under an NIH grant, this page lists all journals that actively comply with the mandate to deposit articles in PubMed Central.
See also the S.U. Library's guide to the NIH Open Access mandate and BioMed Central's Open Access Myths.