MIT OpenCourseWare provides free access to course materials from MIT classes across physics and mathematics.
Caltech provides publicly accessible lecture notes and course materials from university-level physics instruction.
Harvard University hosts open course materials including David Morin's classical mechanics textbook.
Coursera offers recorded university lectures and courses but not problem books or detailed solution sets.
Leonard Susskind's online lecture course covering fundamental physics from classical mechanics to quantum field theory.
Open-access textbooks covering classical mechanics, waves, thermodynamics, electricity and magnetism for first-year university physics.
Wolfram's cloud platform for mathematical and physical computations.
University course or institutional resource (Griffiths Electrodynamics covered).
Moscow State University lectures and course materials on physics and mathematics.
Materials from Moscow State University's mechmath faculty, covering university-level mathematics and physics.
Physics department and courses at Sofia University, organizer of national and European physics olympiads.
Free physics and chemistry courses with exercises for lycée and university level in French.