Google's Dialogflow Enterprise Edition is now generally available. Since the API-based development suite was acquired, and then renamed, from API.AI, it has remained in beta. Now, generally available, developers can use the tools to build conversational interfaces across many platforms.
Nexmo offers a series of cloud-based communication APIs that make it easy to integrate reliable communication services into any application. This tutorial by Tim Lytle on the Nexmo blog shows followers how to build a simple text message group chat using the Nexmo SMS API and PHP.