Sphinx was the first podcast app with lightning and Breeze was 2nd. Breeze is a wallet that plays podcast and they only have ones that support streaming sats and Boosts so arguably they are the most bullish Bitcoin podcasting app. 

Podverse
Castamatic
PodcastGuru
Curiocaster
LNBeats
Truefans

and those are just the ones that support lightning. 

newpodcastapps.com