Zencastr - Record your remote interviews in studio quality.
Cast - Record, edit, publish, and host your podcast.
Forecast - Podcast MP3 post-production tool designed, developed, and used by professional podcasters.
Transistor - Stores your MP3 files, generates your RSS feed, hosts your podcast's website, and distributes your show to Apple Podcasts, Spotify, and more.
libsyn - Podcast hosting, distribution, and monetization platform.
bCast Blog - How To Build A Profitable Podcast.