Merlot (Multimedia Education Resource for Learning and Online Teaching) is a compilation of freely available resources for use in higher education, hosted by the California State Universities.
MIT Open Courseware offers an extensive series of online courses. Courses generally include lecture videos, assignments, exams, and more. Check the Topic: Fine Arts>Subtopic(s): Media Studies for the specialty of Digital Media. Possibly also useful is the subtopic Game Design.
Searchable by discipline and academic level, this site provides a broad range of instructional materials, including texts, images, videos, primary sources and more.
Media Studies courses, via Open Culture list of free online courses
Design courses, via Open Culture list of free online courses