VB-Audio Virtual Cable - Connect Audio Applications together with a Virtual Audio Device
Voicemeeter - Audio Processing and Audio Programming by V.Burel
VAcard - [NOTE: You can download the application from ...
Virtual Audio Cable - Ever wanted to record your speaker output? (loopback) This is for you.
SoundDesk Virtual Devices by LoudLab - SoundDesk Virtual Devices - Software devices to route audio across macOS.
JACK Audio Connection Kit - JACK Audio Connection Kit|Home