Pusher Beams - Send push notifications programmatically at scale
Snowball Smart Notifications - Get the notifications you want and none of the rest
Pingy - Check your site status from your menubar
Engagespot - Engagespot is the easiest way to build your product's multi-channel notification infrastructure. Deliver In-App, Email, Push, SMS, WhatsApp and chat notifications from your app to your users with a single API.
Pushcut - Smart triggers and notifications that kick off your automation. NEW FEATURE: Turn a dedicated iOS device into your personal Shortcuts and HomeKit automation server! The perfect companion for Shortcuts and HomeKit.
PushPrime - Supercharge your website with push notifications