PushCrew - Push Notifications for Websites
Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Bartender Mac App - Bartender is an award-winning app for macOS that superpowers your menu bar, giving you total control over your menu bar items, what's displayed, and when, with menu bar items only showing when you need them.
iZooto - Engage your mobile and desktop web users with intelligent web push notifications.
Vanilla - Vanilla is a free Mac app that lets you hide icons from your menu bar.