https://gpoddernet.readthedocs.io/en/latest/user/clients.html lists over a dozen active clients, depending on how one counts; not sure how current the “active” flags are tho’.
Looking over the issues and pull requests for the gpodder web service I see an overwhelmed volunteer project. I’d hate to see it go down due to catastrophic success. I’m scanning for ways I might be able to help alleviate pressure, both there and here.