OER Home Welcome to Open Educational Resources (OER) at the Open University of Sri Lanka Welcome to our collection of Open Educational Resources (OER) from the Open University of Sri Lanka (OUSL). Open Educational Resources (OER) are web based materials offered freely and openly for use and reuse in teaching, learning and research. These resources have been released under an intellectual property license that permits their free use to reproduce by others. OER provides an alternative way of learning to mitigate the rising costs of education. while providing opportunities for learners who might not otherwise be able to afford or access learning materials. You will be able to access a range of learning materials, videos and audios through OUSLOER.