Smart Tab Mute - Ensures that only one tab is playing sound at the same time
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Mutify - Use a shortcut on any Mac device to mute your microphone
Roomvine - Chatrooms for real life venues, neighborhoods and events
Mute Intercom - Mute annoying sounds from Intercom 🔕
Treadie - Create your own micro-social network for topics