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Free white noise mp3 downloads for personal use. They're excellent for sleeping, studying, meditating, etc.
Works a treat for babies/toddlers and adults - especially if you live in a noisy house/neighbourhood (traffic, construction, etc.)
Or if you already have a Google Home or Home Mini (I presume Alexa can do the same thing): https://support.google.com/googlehome/answer/7364558?hl=en