Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
Voicemod - What are the voice changers? How do these work? Are these illegal? What is a soundboard? Find all the answers here. Voicemod - The Best FREE Voice Changer
Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!
Clownfish Voice Changer - Clownfish Voice Changer is multiple voice changing software for various chatting and gaming platforms.
Soundflower - Soundflower is a Mac OS X system extension that allows applications to pass audio to other...
JN Soundboard - An open-source hotkey soundboard program