Mooculus is a free, open calculus course developed at Ohio State University, delivered as an interactive online course covering single-variable calculus. It is hosted on its own site rather than on the generic course platforms linked in the comment.

A commenter recommends it simply as a good option for learning math alongside Coursera and edX courses.

What commenters said (1)

1. RecommendsGaleno2015in “Ask HN: How can I learn math?”

   There are great courses on http://www.coursera.org and http://www.edx.org

   I like Mooculus, developed at Ohio State http://mooculus.osu.edu

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