Soundflower

Soundflower is a free, open-source software that acts as a virtual audio routing tool for Mac computers. It creates virtual audio channels, allowing users to redirect audio output from one application directly into another—for example, capturing system sound for recording or live streaming. Essentially, it functions like a virtual cable, enabling seamless audio transfer between software without needing physical hardware. This is useful for musicians, podcasters, and broadcasters who want to record or transmit high-quality audio directly from their computer applications with flexibility and ease.