Smart Tab Mute - Ensures that only one tab is playing sound at the same time
Keysmith - Create custom keyboard shortcuts for your Mac and the web
Mutify - Use a shortcut on any Mac device to mute your microphone
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
Relax - Mutes your internal speakers when disconnecting headphones 🎧
Apptivate - A simple, beautiful hotkey manager.