Azure IoT Hub - specialized broker focused on attaching "Internet of Things" devices and edge gateways to the cloud.
Azure WebPubSub - Real-time publish-subscribe messaging for web application client development based on WebSockets
Azure SignalR - Real-time publish-subscribe messaging with a .NET focused programming experience for web application client development based on WebSockets
Azure Notification Hubs - High-scale broadcast and multicast push notification distribution for all popular mobile platforms.