I'm not sure if these will give you a certificate after completion though, like what ICI does. I noticed some free course offers ended last month however, some of the contents run until the end of May. I hope this helps.
I learned that Harvard is offering free courses here: https://online-learning.harvard.edu/catalog/free. Not sure how it works though. I haven't tried any of them. You may want to try 👌👌👌
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