Appsfire.com - Great way to integrate push and in-app notifications. You can also solicit feedback: Ask your users to give you feedback. Direct users with positive responses review you in the App Store. All this is free for developers who utilize the appsfire monetization service. Developers who use only the engagement tools can use it free for up to 1M MAUs or 1M notifications sent per month.
Rzlts.com - RZLTS is currently the only unlimited push messaging management service available free of charge. Most of the other services offer free plans which are restricted and become more expensive as you grow. They're able to offer free service by showing the Sponsored Apps section located at the bottom of each inbox message.
Parse.com - Free push notifications for 1 million unique recipients. $0.05 per 1,000 recipients extra
Pushwoosh.com - Free for 1,000,000 devices & 5 applications
Urbanairship.com - You can compose a push message in a visual web-based editor, preview it on popular mobile platforms including iOS and Android and send it immediately to the people who have installed your app—even when the app is closed on their devices.
Xtremepush.com - XtremePush is a mobile marketing automation platform. Through this platform brands can understand and engage their app users from the moment of download.
Batch.com - Marketing AND transactional push notifications in the same interface.
Zeropush.com - Transactional push notifications to your mobile or web app to engage and inform your users.
Plotprojects.com - Plot Projects is the ultimate Geofencing solution for your app. We allow you to send Geofencing and iBeacon Notifications through your app.
Appoxee.com - This platform makes it easy to create, target and send the right message at just the right time. We provide a range of advanced targeting capabilities to get your users back into your app including automated messaging, or even personalized messaging, giving you the ability to dynamically insert user names directly into your push messages.
Quickblox.com - Quickblox is a proprietary set of client-server solutions that allows you to build more powerful, engaging and secure mobile apps. Quickblox is essential to run mobile apps at professional scale. It is hosted with Amazon Elastic Cloud which means it is reliable and scalable.
Oracle.com - Oracle’s Push Cloud Service extends cross-channel marketing strategies to the world of apps. Delivered standalone or integrated as part of Oracle Cross-Channel Marketing, Oracle Push Cloud Service helps the world's best marketers deliver relevant push notifications that stimulate engagement and drive users back to their applications. Deliver push notifications across devices to enhance your customer experience.
Ibm.com - IBM® Mobile Push Notification provides a flexible, easier-to-use environment for creating notification campaigns that engage mobile app users at the optimal time and place. You can target communications based on your business rules, current segmentation, customer relationship management (CRM) data and customer behavior including current and historical locations.
Mixpanel.com
Which Push Notification service do you prefer?