Public Library of Science

«an international, peer-​reviewed, open-​access, online publication from the Public Library of Science (PLoS). PLoS welcomes reports on primary research from any scientific discipline.»
The best way to get access to scientific and medical journal articles on a myriad of topics for free. PLoS was founded on the principle of making scientific and medical information more available to the public. The articles published on PLoS are open access meaning they can be reproduced and distributed without any risk of copyright infringement or having shell out a bunch of money. PLoS Journals include Biology, Medicine, Computational Biology, Genetics, Pathogens, Clinical Trials, and Tropical Diseases. The availability of information encourages collaboration across disciplines and is just fun to read.