1.) The Magnus Archives - horror mystery drama, different types of horror and “fears”, super good and completed with 200 episodes. It has a lot of bonus content and a sequel, The Magnus Protocol, but I haven’t listened to that one yet.
2.) Stellar Firma - by the same people who made The Magnus Archives, ridiculous sci-fi comedy with deeper stuff under the surface
3.) The Hidden Almanac - supernatural comedy, a radio broadcast in a fantasy world, extremely silly, completed with 893 episodes, but each is like 5 minutes long
4.) Welcome to Nigh Vale - a radio broadcast from a very strange town with very strange residents, silly, spooky and heartfelt, ongoing
5.) Old Gods of Appalachia - wild west eldritch horror, very good atmosphere and voice acting, ongoing
6.) The Lost Cat - horror mystery, a man looks for his missing cat in a very bizarre world, with monsters and reality altering shenanigans, completed at 49 episodes