* https://layer.com/ - The full-stack building block for communications.
* https://layer.com/ - The full-stack building block for communications.
* https://www.parse.com - Mobile backends, free plan has 30 requests per second, with 20 GB of file and database storage, as well as push notifications for up to 1,000,000 unique recipients.
* https://www.parse.com - Mobile backends, free plan has 30 requests per second, with 20 GB of file and database storage, as well as push notifications for up to 1,000,000 unique recipients.
* http://quickblox.com/ - A communication backend for instant messaging, video and voice calling, and push notifications
* http://quickblox.com/ - A communication backend for instant messaging, video and voice calling, and push notifications
* https://pushbots.com - Push notification service. Free for up to 1,500,000 push/month.