1. OneSignal is a free push notification service designed for mobile apps and games.

  2. Push Notifications for Websites

  3. G

    a simple self-hosted server for sending and receiving messages

  4. Real-time notifications on your Android, iPhone, iPad, and Desktop

  5. Engage your mobile and desktop web users with intelligent web push notifications.

  6. Pushbullet - Your devices working better together

  7. Free forever push notifications on Web and Mobile for everyone.

    open-source

  8. Push Notifications Service | Your Apps Can Talk!

  9. MaxTraffic offers an online tool that affects website visitor behavior in a way that increases conversions.

  10. Light SDK for mobile push notifications

  11. Cloud-based two-way emergency notifications and monitoring. Send notifications via text, voice, email, app push notifications, social, conference call, and custom channels.

  12. WP

    FirePush will help your business grow. Automate your online store with web pushes and SMS messages to increase your business sales. Give reminders about abandoned carts, send promotions, delivery updates and make money while you sleep.