Unnamed Reverse Engineering Podcast - it focuses mainly on reverse engineering hardware and firmware. I haven't done any non-trivial reverse engineering projects and even the ones I have done are software but I still find it super interesting.
Darknet Diaries - Podcast revolving around hackers/hacks/etc
Malicious Life - Podcast centered around historical hacks or malware.
Advent of Computing - about the history of computer and computer related technology
ClojureScript Podcast - about clojurescript
Indie Hackers - interviews with indie startup founders
Revolutions - detailed history of various revolutions throughout history. Currently on the revolutions of Russia.
TechStuff - episodes on various tech related topics