Mutify - Use a shortcut on any Mac device to mute your microphone
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
MuteTab - Better tab muting in Chrome
Pliim - One click and be ready to go up on stage and present!
Smart Tab Mute - Ensures that only one tab is playing sound at the same time
Hocus Focus - A Mac menu bar utility that hides your inactive windows