Dialogflow - Conversational UX Platform. (ex API.ai)
Amazon Polly - Named for a parrot, Amazon Polly is a text-to-speech (TTS) software that makes your text come to life in a natural, authentic way. The software has many lifelike voices, both male and female, and in a variety of languages.
Api.ai - Api.
Snips Voice Platform - The first AI-powered voice assistant with privacy
Messenger Platform - Discovery, chat extensions, and richer experiences
VoiceOps - the #1 AI platform for analyzing enterprise voice