Resource is available for free at https://www.merlot.org/merlot/viewSite.htm?id=9159866. Course is listed at https://palsave.palni.org/fall-2019-course-redesign-participants/.
An extensive virtual textbook with grouped links to concepts in organic chemistry. Available online at https://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/intro1.htm.