Question: Do you know of a library that offers a unified messaging interface for various platforms and integrations with external data sources?

If you need a single interface to different messaging platforms and to integrate with external data sources, Maxbot is a good option. This open-source library and framework for conversational apps offers unified messaging across multiple platforms, integration with external libraries and NLU services, and support for dialog management, NLG command language and business logic integration. Maxbot also can be deployed in stand-alone, cloud and hosted environments and can be integrated with external data sources and services.

Another powerful option is Sendbird, a communications API platform that lets developers create messaging experiences across different channels, including chat, AI chatbots, SMS, WhatsApp, voice and video. Sendbird supports one-way messages, two-way conversations and group chats, and offers highly abstracted APIs, SDKs and UI kits for different platforms. It's secure and compliant with industry standards, so it can be used in many different industries.

For a broader range of communication APIs, SignalWire offers tools to create and deploy next-gen voice, messaging and video apps. Its API suite includes options for customizable voice assistants, reliable messaging and video conferencing. SignalWire is designed to be highly reliable and scalable, so it's good for contact centers, education and healthcare.

If you're more focused on integration and automation, Twilio offers a customer engagement platform with APIs for SMS, WhatsApp, voice and email. Twilio lets businesses personalize customer journeys, onboard users securely and manage multichannel communications. With tools like a Customer Data Platform, omnichannel campaigns and strong authentication options, Twilio is used by more than 290,000 brands.