Official OpenTok PHP SDK by TokBox. It provides installation via composer and manual. To start with the SDK, developers can create sessions, generate tokens, and work with archives. An Api Key is available at https://dashboard.tokbox.com/users/sign_in
SoundHound's Hound app allows users to ask complex questions and get an accurate answer really fast. The app combines voice recognition and language understanding functionality to achieve this. The Houndify API allows developers to integrate it in to their own apps and hardware creations.