MuteTab - Better tab muting in Chrome
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Smart Tab Mute - Ensures that only one tab is playing sound at the same time
Pushbullet - Pushbullet - Your devices working better together
Mute Intercom - Mute annoying sounds from Intercom 🔕
Gotify - a simple self-hosted server for sending and receiving messages