Mutify - Use a shortcut on any Mac device to mute your microphone
Muzzle - Silence embarrassing notifications while screensharing
MuteTab - Better tab muting in Chrome
Upscope Screen Sharing for Intercom - No-downloads screen sharing fully integrated with Intercom.
Smart Tab Mute - Ensures that only one tab is playing sound at the same time
Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.