Saylor offers full-length college level courses online. The courses are all open, and can be adapted easily (they even make a guide for it!)
“Saylor Academy is a nonprofit initiative working since 2008 to offer free and open online courses to all who want to learn.
We offer nearly 100 full-length courses at the college and professional levels, each of which is available right now — at your pace, on your schedule, and free of cost.
Whether you are looking for career advancement, degree completion, professional development, or more casual learning, we have something just for you. At Saylor Academy, you can earn modern, digital certificates of completion; earn tuition-free college credit through our network of partner schools; or even start a low-cost, convenient degree program.”