They were. I took them on Coursera. They were free during a promotion I took advantage of a couple months back, I don't know if they still are but it's worth checking out. I did an introducation to AWS Machine Learning and am currently learning Machine Learning project management, offered by Google.
Also some that I definitely know to be free (not on Coursera) are the Google Analytics and Fundamentals of Digital Marketing certifications. They're easy to find online.