Just finished beta support for email and PGP auth on https://indielogin.com! Please give it a try and let me know if you find any bugs! Here are the setup docs: https://indielogin.com/setup
This means it's now feature complete with https://indieauth.com, so I can now start switching over my apps to use it. With any luck I'll be able to switch the https://indieweb.org wiki to it before IndieWeb Summit!