Push Notifications are small pop-ups on the screen of your device. They can appear on the screen of any device where there is an alert area, or there is the possibility of displaying data received from the Internet on the screen.
Best Free And Open Source Push Notification Services:
OneSignal – Multi-platform Push Notification Service. OneSignal provides Push Notification delivery and automation. We have SDKs for iOS, Android, Amazon, Windows Phone, Unity 3D, Phonegap, Marmalade & more!
Pushkin is a free open source tool for sending push notifications. It was developed with a focus on speed and enabling fast experimentation. Pushkin was mainly built for supporting online mobile games, but can easily be extended to any type of application. It supports both Android and iOS platforms.
Uniqush – Push Notification Solution for Mobile Platforms. Uniqush is free and open source software which provides a unified push service for server-side notification to apps on mobile devices. By running Uniqush on the server side, you can push notification to any supported mobile platform.
AeroGear – Open Source Libraries for Mobile Connectivity. Send push notifications from the Unified Push Server via 7 push networks to any mobile device.
Z-Push is an open-source application to synchronize ActiveSync compatible devices such as mobile phones, tablets and Outlook 2013 and above. With a history of over 9 years of successful synchronization with multiple backends Z-Push is the leading open source push synchronization.
OpenPush – Develop Once, Push Everywhere. Ubiquitous Push Notification Service, targeting all types of devices (mobiles, tablets, desktops and laptops, televisions), focusing on personal notifications (as opposed to device targeted notification). Open BETA.
Appwoodoo – CMS for native Android and iOS apps. Update your app like a website! The simplest way to add a content management panel to apps: future-proof and native on Android or iOS.