Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
Clownfish Voice Changer - Clownfish Voice Changer is multiple voice changing software for various chatting and gaming platforms.
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Soundpad - Play sounds in voice chats in high digital quality.
Soundflower - Soundflower is a Mac OS X system extension that allows applications to pass audio to other...
Voxal - Modify your voice in any application that uses a microphone. From girl to alien, the voice options for online video games, avatars and podcasts are limitless.