edX is an American massive open online course provider created by Harvard and MIT. It hosts online university-level courses in a wide range of disciplines to a worldwide student body, including some courses at no charge. It also conducts research into learning based on how people use its platform.

Coursera Inc. is a U.S.-based massive open online course provider founded in 2012 by Stanford University computer science professors Andrew Ng and Daphne Koller. Coursera works with universities and other organizations to offer online courses, certifications, and degrees in a variety of subjects.

OER Commons is a public digital library of open educational resources. Explore, create, and collaborate with educators around the world to improve curriculum. OER Commons is a freely accessible online library that allows teachers and others to search and discover open educational resources and other freely available instructional materials.

Since 2001, MIT OpenCourseWare has been creating new opportunities for millions of learners and educators, sharing Open Educational Resources (OER) from MIT and helping to lead a global revolution in free access to knowledge. MIT OpenCourseWare continues to build on this foundation. With a new web platform, ever-growing content, and collaborations across the vibrant open education ecosystem, we're creating a world of more equitable and inclusive education for all.

By placing the research community at the heart of everything we do, we strive for a future where researchers are motivated to work together, empowered with the tools and services they need to do so, and freed from any barriers that stand in their way. We aim to maximize the impact of scientific research through openness and global collaboration as we truly believe that science works best when research is open.

BMJ Journals is a collection of more than 60 medical and allied science titles. They are published by BMJ, the global healthcare knowledge provider and pioneer in the development of open access. We support health professionals and researchers everywhere. Our journal collection includes some of the most influential titles in their field. By partnering with royal colleges and leading scholarly and professional medical organisations, we publish the latest and most relevant research.

The Open Access medical journal for a new generation of doctors, researchers, and patients. We’re eliminating barriers to the generation and dissemination of medical knowledge. Based in San Francisco, California, Cureus is a Springer Nature journal leveraging the power of an online, crowdsourced community platform to share and promote published medical knowledge around the world.

Medicine® is an open access publication, providing authors with continuous publication of original research across a broad spectrum of medical scientific disciplines and sub-specialties. The Medicine® review process emphasizes the scientific, technical and ethical validity of submissions. Novelty or potential for impact are not considered during the manuscript's evaluation or adjudication.

A pioneer in scholarly, open access publishing, MDPI has supported academic communities since 1996. Based in Basel, Switzerland, MDPI has the mission to foster open scientific exchange in all forms, across all disciplines. Our 427 diverse and open access journals, including 418 peer-reviewed journals and 9 conference journals, are supported by more than 115,000 academic experts who share our mission, values, and commitment to providing high-quality service for our authors. We serve scholars from around the world to ensure the latest research is freely available and all content is distributed under a Creative Commons Attribution License (CC BY).