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   * [Ably](https://www.ably.com/) - Realtime messaging service with presence, persistence and guaranteed delivery. The free plan includes 3m messages per month, 100 peak connections, and 100 peak channels.
   * [cloudamqp.com](https://www.cloudamqp.com/) — RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ's
   * [courier.com](https://www.courier.com/) — Single API for push, in-app, email, chat, SMS, and other messaging channels with template management and other features. The free plan includes 10,000 messages/mo.
+  * [Engage](https://engage.so/) - All-in-one Customer Engagement and Automation Tool (email, push, SMS, product tours, banners and more) for SaaS. Free for up to 1,000 active users per month.
   * [engagespot.co](https://engagespot.co/) — Multi-channel notification infrastructure for developers with a prebuilt in-app inbox and no-code template editor. Free plan includes 10,000 messages/mo.
   * [HiveMQ](https://www.hivemq.com/mqtt-cloud-broker/) - Connect your MQTT devices to the Cloud Native IoT Messaging Broker.  Free to connect up to 100 devices (no credit card required) forever.
   * [knock.app](https://knock.app) – Notifications infrastructure for developers. Send to multiple channels like in-app, email, SMS, Slack, and push with a single API call. The free plan includes 10,000 messages/mo.