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.
Twilio has released a beta version of its Conversations API. The unified API allows developers to aggregate messages across channels (SMS, MMS, Chat, and WhatsApp) into a single conversation. Additionally, administrators can control the conversation and supplement with experiential features.