I've tried out quite a few, but the ones I've stuck with are:
Destination Linux: I haven't listened to it in a whule because I barely have any time left for it, but it can often be very interesting and educational.
Tech over Tea: It's an Interview-style podcast where Brodie Robertson, a well-known Linux YouTuber, interviews a member of the Open Source community, usually a developer, about their project and you could often get some interesting insights into the life and responsibilities of an open source developer, as well as some interesting stories during development and insights into what the future of the project might look like.