Ginger Audio Ground Control is a free Soundflower alternative
https://www.gingeraudio.com/
Ginger Audio has introduced Ground Control, a virtual audio device for macOS. Ground Control makes it easy to send multi-channel audio streams from one application to another with zero latency, picking up where Soundflower left off. And it’s free!
Ground Control is designed to easily pass audio from one app to another. Ground Control has zero latency and provides up to 64 channels at sample rates up to 192 kHz. It also works on the latest Macs, including the M1 processor and macOS Big Sur.
Ground Control adds three virtual audio devices to your macOS Audio/MIDI Setup. There’s a basic 2-channel device for stereo streams, and two multi-channel variants with 16 and 64 channels. To route audio between applications, all you need to do is select Ground Control as the audio output device in the source application and as an audio input device in the target app.
Ground Control also lets you monitor the virtual audio stream so you can hear what’s going on. The Ground Control Cube app provides a large volume knob alongside mute, dim, and mono buttons. There’s also a VU meter that helps to catch any clipping that might occur. This is a nice touch that sets Ground Control apart from other solutions.
Ground Control is currently only available for macOS, but a Windows version is in the works. It requires macOS 10.13–10.15.7 or macOS 11 Big Sur and supports Intel and M1 processors.
https://www.gingeraudio.com/