https://omniglot.com/soundfiles/
A list of the audio recordings in many different languages available for download on Omniglot.
omniglotsoundfiles
https://blog.veni.com/?p=252
Just found this (thanks, Anne-Rachel!): Omniglot. It allows me to check the spelling, pronounciation, and different meaning of every letter in every alphabet.
writing systemsthe worldomniglotlanguagesveni