SkavarSharraddas

Audiobooks have a simple workaround if you can find a version of the book in text format to download, just index that.

Calibre can create a full text index to search through everything (well, for files that actually contain the text, and it needs a lot of space).

Nothing, some people just dislike the slow pace of its development or some design decisions and fork it (and in the process remove or break less used functionality, like Podcini can’t read any feeds on my old Android 7 phone).

So what’s the open source alternative you found? Sounds like it needs more advertising.