This issue of eLearning Papers is dedicated to the thriving work around Open Educational Resources (OER) by committed individuals, institutions and user communities. Five selected papers by the guest editors investigate the organisational, social, cultural, pedagogical and technical aspects of implementing OER.

Open Educational Resources (OER) are learning and teaching materials that are offered freely to anyone under licenses that allow to use, modify and distribute the items. But that's not all. Through the world-wide movement of OER, magnified with user-generated content and underlying Web 2.0 technologies, the advantages and opportunities are numerous for teachers, authors, eLearning practitioners, developers and content providers, researchers and decision-makers, and last but not least: learners.