By people with Less Wrong profiles

Rationally Speaking Julia Galef (not currently updating)
Future Strategist James Miller
Second Enumerations Grognor
The untitled and not-properly-indexed occasional podcasts between Robin Hanson and Katja Grace
The Bayesian Conspiracy Eneasz Brodski and Steven Zuber
The Mind Killer Eneasz Broski, Wesley Fenza, and David
Science, Ethics, and the Future Brian Tomasik
Conversations from the Pale Blue Dot Luke Muehlhauser
Tsuyoku Naritai! Alex Hedtke (not currently updating).
The 80,000 Hours Podcast Rob Wiblin
Affix by Brian and Chris (not currently updating)
Clearer Thinking Spencer Greenberg

Obviously rationalist-adjacent