Via LLRX – Open Educational Resources (OER) Sources 2018 – Costs continue to rise for students who are pursing college and post graduate degree programs. By leveraging best practice sites, services and non-traditional options to expand knowledge, skills and abilities in many disciplines, students can choose from a wide range of options to complete their respective goals. This guide by Marcus Zillman is a comprehensive listing of useful open source educational resources, sites, e-books and courses on the Internet that can assist you in optimizing your learning opportunities.