Ein praktisches kleines Nachschlagewerk zum Thema Open Educational Resources (OER) ist in der Reihe Synergie Praxis erschienen:
Open Educational Resources 2017 [PDF]
Open learning materials are not yet very common. Here are two platforms with a wide range of materials:
MIT OpenCourseWare makes MIT course materials online available to everyone.
Founded at Rice University, OpenStax CNX offers educational materials, organized into thousands of textbook-style books.
There is a course on quantum physics by the Massachusetts Institue of Technology available:
MIT 8.04 Quantum Physics I