MessageBird Chat API - Connect with your customers through different messaging apps
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Voiceflow - Build voice apps in your browser without coding
Jovo - 🗣 Build cross-platform apps for Alexa and Google Home
Twilio Notify - One API to orchestrate notifications across SMS, push & more
BotTalk - Create Alexa skills and Google Assistant actions with Markup