I'm currently enjoying MIT OpenCourseWare Department of Science but I wonder if there are some resource like it or even better (or a little worse, I don't know). I already tried looking up on google but you get stuck with edX, Coursera, and Alisson results loophole (which I already use from time to time).
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It is a great thing that you brought this up because I am actually wondering about the same thing. Anyway, I have been also looking into sites such as Coursera. It is a great thing that there are a lot of courses offered at the site. It is the perfect place especially for those who are eager to learn different courses. Anyway, I will definitely have this thread saved for future reference.
So far, I only like two websites: The Ultimate STEM Guide for Kids (239 Cool Sites) and Tynker (Coding for Kids). The former consists of countless resources, games, contests and even summer camps, whereas the other is a fun and easy platform about computer programming. It uses amazing and well-designed visuals for quick and easy understanding of 4th to 8th grade students.