Open Educational Resources

Open Educational Resources (OER) are teaching and learning materials that you may freely use and reuse at no cost, and without needing to ask permission. Unlike copyrighted resources, OER have been authored or created by an individual or organization that chooses to retain few, if any, ownership rights.

In some cases, that means you can download a resource and share it with colleagues and students. In other cases, you may be able to download a resource, edit it in some way, and then re-post it as a remixed work. How do you know your options? OER often have a Creative Commons license or other permission to let you know how the material may be used, reused, adapted, and shared.”

(source: OER Commons. (n.d.). Getting Started with OER. Retrieved Nov. 19, 2019, from

OER TU Delft

  • Open Courseware: free courses and open-licensed course materials
  • TU Delft Open Textbooks: freely accessible textbooks produced by TU Delft teachers and used in bachelor and master courses.
  • TU Delft MOOCs: Massive Open Online Courses from Delft University of Technology

OER Worldwide

Open Textbooks

Not included in OER Metafinder and OASIS:

    European eBook publisher with 1000+ textbooks freely available to download. E-books are primarily in business/economics, engineering/natural sciences and IT.
  • IntechOpen – Open Access Book
    World’s largest Science, Technology & Medicine Open Access book publisher. The website contains more than 3,000 open access books distributed under CC BY 3.0 license in various subjects.World’s largest Science, Technology & Medicine Open Access book publisher. The website contains more than 3,000 open access books distributed under CC BY 3.0 license in various subjects.
  • MERLOTx – Open Textbooks
    Mostly Open (Creative Commons) but some free or low cost textbooks from all over the web. Some are peer reviewed and accessible; others are not. MERLOT has a powerful search tool that allows you to narrow down by topic, level, and resource type.

Open Courses / course material

Not included in OER Metafinder and OASIS, in alphabetical order:

  • Archive
    This library contains hundreds of free courses, video lectures, and supplemental materials from universities in the United States and China.
  • Class Central
    Free online courses and MOOCs from top universities around the world; with reviews.
  • Edusources
    Open educational resources with Creative Commons licence from Dutch higher education institutions.
  • Khan Academy
    Free online courses in math, science, and more, created by experts.
  • MOOC List
    Free online courses and Massive Open Online Courses (MOOCs) offered by universities around the world; with reviews
  • OpenupEd
    MOOC provider for higher education.
    Open educational resources repository containing high-quality learning materials written by Penn State Faculty. These materials are freely available to use, reuse, revise, remix, and redistribute under a creative commons license.
  • PhET
    Free interactive simulations for science and mathematics.
    A free and open collection of college level courses developed by a team of experienced college professors. Courses are licensed using Creative Commons.
  • Skills Commons
    Free and open learning materials for job-driven workforce development.

Open multimedia

Large providers of open-licensed images, photos and/or videos in alphabetical order:

  • Europeana
    Europeana Collections provides access to over 50 million digitised items – images, videos, text and more – with search and filter tools to help you find what you’re looking for. Don’t forget to check the license info.
  • Free Stock
    Free photos in the public domain (no copyright restrictions) or Creative Commons license. Site now owned by Shutterstock, whose for-pay images may show up in searches but are clearly watermarked.
  • OASIS (Openly Available Sources Integrated Search)
    Performs a simultaneous seach across 97 different sources of open education materials, including Librivox (audiobooks), Phet (interactive simulations), Wisc-online (images, animations, audio and video clips) and TED (talks).
  • Pexels
    Photos and videos licensed under the Creative Commons Zero (CC0) license.
  • Pixabay
    Free photos, illustrations, vectors and videos.
  • Techniek Beeldbank
    Free to download images and videos of learning and working in technology.
  • Unsplash
    Free high-resolution photos. All photos published on Unsplash are licensed under Creative Commons Zero.
  • Videezy
    HD stock footage and videos. Don’t forget to check the license info.

More websites can be found on the Free material page.