Podtail

Podtail started in Scandinavia and built a strong following in Nordic countries, while also indexing a broad international catalog of shows. It's a good example of a directory that punches above its weight in specific regions rather than trying to be everywhere at once.

This is worth paying attention to if your show has, or wants, a European or specifically Nordic audience, since Podtail's regional strength genuinely means something there.

The honest catch is that outside those stronger regions, Podtail is just one more directory among many, so don't expect it to be a major growth driver for a US-only audience.

As with most aggregator-style directories, your feed shows up automatically, there's little active management required beyond keeping metadata accurate.