With more than 2,400 courses available, OCW is delivering on the promise of open sharing of knowledge. With more than 2,400 courses available, OCW is delivering on the promise of open sharing of knowledge. MIT OpenCourseWare makes the materials used in the teaching of almost all of MIT's subjects available on the Web, free of charge. MIT OpenCourseWare makes the materials used in the teaching of almost all of MIT's subjects available on the Web, free of charge.