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   * [pusher.com](https://pusher.com/beams) — Free, unlimited push notifications for 2000 monthly active users. A single API for iOS and Android devices.
   * [pushtechnology.com](https://www.pushtechnology.com/) — Real-time Messaging for browsers, smartphones and everyone. 100 concurrent connections. Free 10 GB data/month
   * [quickblox.com](https://quickblox.com/) — A communication backend for instant messaging, video and voice calling and push notifications
+  * [restspace.io](https://restspace.io/) - Configure a server with services for auth, data, files, email API, templates etc, then compose into pipelines and transform data.
   * [simperium.com](https://simperium.com/) — Move data everywhere instantly and automatically, multi-platform, unlimited sending and storage of structured data, max. 2,500 users/month
   * [stackstorm.com](https://stackstorm.com/) — Event-driven automation for apps, services and workflows, free without flow, access control, LDAP,...
   * [streamdata.io](https://streamdata.io/) — Turns any REST API into an event-driven streaming API. Free plan up to 1 million messages and 10 concurrent connections