Beautiful Public Data (https://www.beautifulpublicdata.com/) is one of my best finds.
Others I read via RSS include:
Wladimir Palant's blog 'Almost Secure' https://palant.info/articles/
Ctrl.blog https://www.ctrl.blog/
Troy Hunt's blog https://www.troyhunt.com/
Molly White's newsletter https://newsletter.mollywhite.net