MIT OpenCourseWare
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OpenCourseWare predates the modern MOOC boom by a decade, launched in 2001 as MIT's commitment to publish real course materials from across the university rather than build a separate consumer product. It has stayed close to that original mission: syllabi, assignments, exams, and often recorded lectures, exactly as used in an actual MIT class.
There's no discussion forum, no grading, no certificate, and no interaction with an instructor or other students, which makes it closer to a library than a course platform. It fits a self-directed learner who wants genuine MIT-level course content for free and doesn't need external validation of having finished, particularly useful for reviewing a specific topic in depth rather than following a guided path from zero.