During Open Access Week why not try searching for free articles in CORE?
CORE aggregates research papers from data providers from all over the world including institutional repositories, subject repositories and journal publishers.
It currently contains over 134 million open access articles, from tens of thousands of journals, collected from 3,699 repositories around the world. Use either simple or advanced search and get instant seamless access to full PDF articles.
Contact us for more information, and look out for more tips for Open Access week.