Mine would be Cassidy William's newsletter: https://tinyletter.com/cassidoo. It's free, but there was a few newsletters where she linked her Venmo/Paypal in case people wanted to support, and I contributed during that time. She's since removed those from the letters for whatever reason. This newsletter is great on a Monday morning because it's light and has some interesting/cool links in it.

Another great one would be Kent C Dodds' newsletters: https://buttondown.email/kentcdodds. Kent is highly active in the React/JS/OS community and he's a super great guy. Same deal here, its free but you can choose to support, which I do from time to time. His newsletters are focused on JS/React and are a bit more dense, but they're interesting.

Scott's Cheap Flights. No affiliation. I probably don't travel enough to justify paying, and when I can travel I just buy the dates available, but if you have lots of spare time, they do a great job of curating low-cost tickets. I especially like that they mention things like "no bag fee" and "nonstop" — not just some random aggregator, but actually handpicked and digested.

https://scottscheapflights.com/