For you GrapheneOS nerds nostr:npub1w4l9wx8rv529jk0tc3fz0mu2vqc4m7pkjhvv4cvscpl83pmeudnsggrxhw is open source and has an F-Droid version. This app hasn't been updated in almost a year because it's being overhauled but it's my daily driver for podcast listening and it's been solid.

https://f-droid.org/en/packages/com.podverse.fdroid/