I have just discovered Castopod and I am still amazed by the depth of the Fediverse and ActivityPub protocol.
It's a platform to host audio podcast. And like with Peertube, you can follow accounts on one instance of Castopod directly through Mastodon.
Mastodon: @Castopod
Website: https://castopod.org/
Follow
@rwmpelstilzchen @Couka
As Castopod is self-hosted we cannot know. There are Castopod instances that we never heard of!
We will probably create a list where podcasters can voluntarily add their podcasts in the near future.
In the meantime you can search for "Powered by Castopod" on your favorite search engine. 😉
@Castopod @rwmpelstilzchen I know it must be a lot of work but if I recall correctly, joinmastodon.org asks for request by email from admin of mastodon instances to add it on their website.
I think it can only be manual if you want to moderate the content of such a list.