When I think of resources for calculus, I always think of calculus-help.com. I was first introduced to this site when I took calculus in high school. My teacher showed us the first video on the site about limits. I have watched several of the videos on this site, and they all have simplistic explanations of important calculus concepts. If I ever taught calculus, I would like to show my class some of the videos in class so the students can see another approach to these topics. The site even provides example problems that correlate to the AP Calculus AB exam. W. Michael Kelley created this site to help students feel more comfortable about calculus concepts, but he also wrote several other helpful books for other math classes. He has written The Humungous Book of Calculus Problems, The Humungous Book of Geometry Problems, The Complete Idiot's Guide to Precalculus, and many more books that can help anyone succeed in math.
All of the resources on this site are completely free, although you would have to purchase his books if you would like to have your own copy. Since the site was created by w. Michael Kelley, he has advertisements on the side for his books that could further help students learn math. Otherwise, the site is not commercialized. The site is appropriate for high school students, although many students who are not taking calculus would find the site fairly useless. While the site has excellent videos for topics like limits, continuity, and derivatives, there are no videos for integration, sequences, or series. These three topics are actually much more difficult for students to grasp than the ones that are addressed on the site, so I would like to see more videos posted in the future for these topics.
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