Pabulong adds a microphone called Pabulong Mic to your Mac. Choose it in your call app and people hear your voice without the noise, echo and voices around you.
This installs Pabulong in your Applications folder and the Pabulong Mic audio driver. macOS will ask for an administrator password. Sound on your Mac stops for a moment while the driver loads.
Pabulong is free and open source. It works on your Mac, and your audio and recordings never leave it. It checks for updates only if you turn that on.