Clyp - Clyp is the easiest way to record, upload and share audio. No account required.
Anchor.fm - Record bite-sized podcasts that anyone can join ⚓
Audio Hijack - Record any audio, with Audio Hijack!
ZCast - Live interactive podcasting with your Twitter followers
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
ReadBit - Read wisely & save time with text-to-speech audiobook reader